Series CA7 Contactors: to 60 HP

Small Dimensions As Little As 45mm Wide

Providing Big Performance In Small Package

The CA7 represents the most modern and flexible IEC power contactor available today. A wide selection of ten contactors in four frame sizes covers the entire CA7 horsepower range (up to 60HP @ 460/575V). Six of the contactors are only 45mm wide, an extremely small footprint for such rugged performance.

New 24V DC Electronic Coils

The newest addition to the CA7 line includes a 24V DC Electronic Coil. This new design is the same size as the AC contactors, providing a compact unit for DC applications. Very low inrush and low power consumption result in a smaller power supply and smaller panel size. Learn more from the CA7 Electronic DC literature.

Type 1 And Type 2 Coordination

Whether you are designing motor circuits for use in North America, Europe or any other part of the world, all CA7 contactors have been designed and tested with respect to Type 1 and Type 2 short circuit coordination.

Advanced Safety And Reliability Features

The entire CA7 line features mechanically linked contacts, such that if a main power pole welds, adequate clearances exist (greater than or equal to 0.3mm) to ensure that the auxiliary contacts do not change state when coil power is removed and the device tries to open. This is a requirement in safety circuits.

Modular Accessories Are Common To All Devices

All accessories are interchangeable among all CA7 contactors and CS7 control relays. This minimizes inventory requirements and maximizes flexibility.

Reversible Coil Provides Total Flexibility

When shipped, both coil connections are normally located at the top of the contactor in preparation for mounting an overload relay at the bottom. For multi-starter panels, however, the coil can be reversed. CA7 contactors can either be ordered with the coil reversed or may be easily reversed in the field.

Dual Power Terminals Speed Wiring

CA7-30 through 85 contactors are designed with two power terminals for all three poles. This simplifies power wiring of interconnected contactors in reversing, reduced voltage and two-speed applications. Simplified wiring means less labor and less cost.

International Standards And Approvals

All Sprecher + Schuh contactors are UL-listed and CSA-approved. They also carry the CE mark and meet IEC 9471 requirements. They are approved in virtually every international market.

An Ingenious Miniature Contactor and Starter System

Providing Big Performance In A Small Package

The CA8 miniature contactors and starters provide an extremely compact and reliable method of controlling motors of 7.5 HP or less (@460V). The CA8 is an economical choice for applications where space is limited or where a minimal enclosure is desired. Components are DIN-rail mountable for instant installation and modification. Fittings are also included on the CA8 for base mounting. All terminals are clearly marked and shipped in the open position for installation with either manual or power screwdrivers.

Small And Rugged

Even though their contacts and coils are not replaceable, Sprecher + Schuh has subjected this series of contactors to monitored endurance tests that demonstrate their ruggedness. At full load, under 3-phase power, the contacts in the CA8 have an electrical life of 700,000 operations, while the AC magnet system has a mechanical life of 10,000,000 operations.

The CAT8 Starter — Efficient And Reliable

This miniature starter features the new CT8 Thermal Overload Relay. A complex current limiting calibration procedure performed after each unit is what ensures the consistent high quality of Sprecher + Schuh’s thermal overload relay. Today’s Class 10 T-frame design like the CT Series has been recognized by many motor manufacturers as the ideal type to assure optimum motor protection due to less use of copper and iron.

The CL8 Ecombo Motor Controller

Sprecher + Schuh's newest miniature contactor is also available in a UL approved motor circuit control, in reversing and non-reversing models for AC and DC control power. This compact and versatile controller can reduce panel space and offers a variety of control schemes in an easy to install, state-of-the-art combination starter assembly that includes the Type F KT7 Self-Protected, Combination Motor Circuit Controller.

Accessories Require No Additional Panel Space

The entire CA8 System is logically engineered. Modular accessories like auxiliary contact blocks snap-on without increasing the CA8's original width of 45mm. Also, due to its horizontal switching movement, the basic contactor has the same low profile whether an AC or DC operating magnet is used. This permits the use of enclosures with shallow mounting depths. Once the CA8 is installed, all auxiliary contact blocks can be snapped-on or removed without changing any existing power wiring. Other accessories include a snap-on RC Link (surge suppressor), mechanical interlocks and space saving adaptors for connecting auxiliary components.

Motor Protection

MOTOR PROTECTION

CEP7 Solid State OL Relays/2nd Generation

Advanced Solid State Motor Protection

The introduction of the second generation of CEP7 solid state overload relays advances Sprecher + Schuh’s leading edge technology with several improved features like:

• Selectable trip class and field-installable modules
• A wider (5:1) set current adjustment range
• A more robust mechanical and electrical mounting
• Self-sealed latching mechanism

The basic concept of utilizing Application Specific Integrated Circuits (ASICs) resulting in an affordable solid state overload relay remains unchanged. This kind of versatility and accuracy was simply not possible with traditional bimetallic or eutectic alloy electromechanical overload relays.

Fewer Units Means Greater Application Flexibility

The new CEP7 is available in three basic models:

• CEP7-ED1 is a Class 10 manual reset model available up to 27 amperes, which covers the most common horsepower motors and everyday applications. This model is economically priced to be competitive with adjustable bi-metallic overload relays.
• CEP7-EE is full-featured, selectable trip class (10, 15, 20 & 30) 3-phase application overload relay with provision for field-mountable modules to handle remote reset, stall and other functions previously available only in higher priced electronic overload relays. Manual reset or automatic reset can be selected with dip switches on the new CEP7-EE models.
• CEP7S-EE is a 1-phase application overload relay packing all the features of the 3-phase CEP7-EE model.

Wide Current Adjustment Range

Thermal or bimetallic overload relays typically have a small current adjustment range of 1.5:1, meaning the maximum setting is 1.5 times the lower setting. The first generation of CEP7 caused the industry to take note when it introduced a 3.2:1 adjustment ratio. A wider adjustment range is the primary reason for the industry's turn to specifications calling for electronic overload relay protection rather than thermal overload relay protection. Capable of adjustment to a maximum of five times the minimum set current, Sprecher + Schuh's second generation CEP7 overload dramatically reduces the number of on-hand units required to cover the full range of current settings up to 90 amperes.

Selectable Tripping Class

With today’s lighter T-frame motors, Class 10 overload relays (relays that trip within 10 seconds of a locked rotor condition) have become the industry standard. If your application requires a longer motor run-up time, the new CEP7-EE has DIP-switches providing selectable trip classes of 10, 15, 20 or 30 seconds. This enables you to closely match the trip class with the run-up time of the motor.

Choice Of Reset Options

Most industrial applications call for an overload relay that must be manually reset in the event of a trip. This permits the cause of the overload to be identified before the motor is restarted. In specialized cases, however, such as rooftop AC units or where restarting the motor will not harm people or equipment, automatic reset may be desired. CEP7-ED1 overload relays come with manual reset for cost economy, while the CEP7-EE models have selectable manual and automatic reset modes.

More Robust Design

The CEP7 has been redesigned to physically extend to the backpan, therefore aligning the mounting of the overload with the corresponding contactor. Further, the mechanical attachment and direct electrical connection to the contactor have been beefed-up, providing a more robust mounting. This means less damage during shipping and field wire installation. The bipolar latching relay which controls the normally-closed trip contacts and normally- open alarm circuit contacts has been self-enclosed, insulating the electro-magnet and shielding against airborne metal particles and other environmental debris. The new CEP7 has been tested to operate in -20° C to 60° C (140 °F) and withstand 3G of vibration or 30G of shock on a mountain as high as 2000m or in a jungle with 95% humidity. Reliability under every conceivable environmental condition is built into the design of this second generation CEP7 electronic overload relay.

Increased Accuracy And Improved Motor Protection

Microelectronics provide flexible and accurate motor overload protection. Unlike traditional overload relays that simulate heat build-up in the motor by passing current through a heater element, CEP7 solid state overload relays measure motor current directly through integrated current transformers. The transformers, in turn, create a magnetic field that induces DC voltage onto the ASIC board. The electronics identify excessive current or phase loss more accurately, and react to the condition with greater speed and reliability than traditional overload relays. In addition, CEP7 solid state relays offer setting accuracies from 2.5 — 5%, and repeat accuracy of 1%.

Self-Powered Design Means Convenience

By developing the power it requires from the applied voltage, the CEP7 is "self-powered," eliminating the need for a separate control power source. This is not the case with some competitive electronic overload relays. Since the CEP7 is self-powered and a traditional auxiliary contact is used to interface with the contactor, the user can apply the CEP7 in the same way as an electromechanical overload. No special connections or control schematic diagram provisions are required in 3-phase applications.

Dramatically Lowered Energy Requirement Saves Money, Reduces Panel Space

Because traditional overload relays work on the principle of "modeling" the heat generated in the motor (recreating the heat in the bimetal elements or heaters), a significant amount of energy is wasted. In traditional bi-metallic overload relays, as many as six watts of heat are dissipated to perform the protective function. Because the CEP7 uses sampling techniques to actually measure the current flowing in the circuit, very little heat is dissipated in the device — as little as 150 milliwatts. This not only reduces the electrical energy consumed in an application, but can also have a dramatic impact on the design and layout of control panels. The density of motor starters can be much greater because less heat is generated by each of the individual components. Higher density means smaller control panels. In addition, special ventilation or air conditioning that might have been required to protect sensitive electronic equipment such as PLCs can be reduced or eliminated. The CEP7 overload relay's dramatically reduced energy requirement saves money and reduces panel space.

Superior Phase Failure Protection

The CEP7’s on-board electronics constantly monitor all three phases. If the ASIC board senses that one phase is missing during a steady state running condition on a fully loaded motor, it will trigger in 3 seconds. If a single phase condition is present during starting, the CEP7 will trip within 8 seconds (for a motor >80% loaded). These times are much faster than any thermal bimetallic overload relay. In addition, CEP7 overload relays detect a 50% phase imbalance in the same way as a phase loss.

CT8 Thermal Overload Relays

Simple And Effective Motor Protection For Applications 7.5HP@ 460V (10HP @575V)

Consistent And Reliable Protection

The new CT8 is an economical thermal overload relay yet includes proven features like "Differential tripping", Automatic/Manual reset modes, and isolated alarm circuit contacts as standards. The consistent high quality of Sprecher + Schuh thermal overload relays is ensured by a complex current calibration procedure performed after each unit is at full operating temperature. Calibration is performed at the largest and smallest current the overload can handle. The accurate time/current characteristic curve obtained in this manner guarantees reliable motor protection every time.

Superior Class 10 Characteristics

Today's T-Frame motors have less copper and iron than the old U-Frame motors that were popular when traditional Class 20 overload relays were designed. For this reason, faster Class 10 overloads like the CT8 Series have been recognized by many motor manufacturers as the ideal type to assure optimum protection of "T" frame motors.

Protection From Single Phase Conditions

A unique feature not found in traditional thermal overload relays provides accelerated tripping under single phase conditions. This is accomplished with a special "differential tripping" mechanism built into CT8 (see illustration at right).

Ambient Temperature Compensation

All Sprecher + Schuh thermal overload relays are temperature compensated. An additional bimetallic ambient compensation strip, built into the conductor- bimetal transmission path, ensures that the tripping characteristics of the relay remain constant over an ambient temperature range of -25°C to +50°C.

Single Phase Applications

CT8 Series thermal overload relays can be applied for protection of single phase AC motors. The relays have the same characteristics as shown for three phase operation. To maintain these characteristics, each element of the overload relay must carry the motor current as shown in the schematic on page C88 in the Miniature Contactors and Starters Supplement Guide (or ssna9000 Catalog).

Other Standard Features

CT8 thermal overload relays feature a fail-safe "trip-free" design that prevents the device from being held closed during an overload. In addition, a selectable reset button permits any one of three reset options to be chosen: test, manual or automatic modes. A separate NO signal contact is also provided on CT7 overloads which is isolated from the NC trip contact. This permits the use of a trip signal voltage different than that of the control voltage.

International Standards And Approvals

Sprecher + Schuh CT thermal overload relays are UL-listed and CSA-approved. They also carry the CE mark.

D7 Pilot Devices

The Economical Solution For High Performance Control, Signaling And Switching Applications

Sprecher + Schuh's rugged D7 pilot devices offer maximum flexibility and a wide choice for all applications. This 22mm line is aesthetically appealing and modularly designed to make assembly and interchangeability easy. The D7 operators are available in two different body styles to meet every application need. Both operators exhibit a new lower profile, stylish appearance while maintaining the rugged performance necessary for demanding environments.

Two Operator Types

D7P is a plastic operator with a captive black plastic front bezel. Constructed of high-grade thermoplastics the D7P is the corrosion resistant solution for harsh environments.
For super tough applications, the D7M has a die-cast zinc housing and mounting ring for rugged durability. Both are finished with corrosion resistant chrome plating. The D7M also features a captive shiny metal bezel for a polished appearance.

Less Inventory, More Choices

Sprecher + Schuh offers D7 pushbuttons in a wide range of devices — from selector switches to multifunction pushbuttons. Their modular design keeps the number of required parts to a minimum, while offering multiple functions and a variety of style and color combinations.
Back-of-panel components can be combined with all front elements, making the D7 line extremely flexible. This approach reduces inventory, yet provides virtually any configuration you require.

Quick, Easy Installation

A standard anti-rotation tab keeps front elements from turning or falling off the control panel, making it possible for one person to install all D7 components even if the front and rear panel are not accessible at the same time. A central mounting ring allows for quick installation and removal of all D7 operators. All back-of-panel components including contact blocks and power module elements snap-on and are readily accessible and interchangeable without removing the pilot device from the panel.

Tool-Less Mounting Latch

The D7 "tool-less" mounting latch mates the front element with the contact blocks and other back-of-panel components. The mounting latch is available in a plastic and metal design. The latches are easily installed with a "click" and removed by pushing a rotating collar to the right. Quick, reliable and strong, it's the best pilot device mounting latch available in the industry.

Long Electrical And Mechanical Life

Most D7 operators have a mechanical life of ten million operations... five million contact blocks. Electrical life ranges from 500,000 cycles at 3A to ten million at 0.1A. The D7 line is also electronics-compatible with self-cleaning contacts.

Environmental Ratings

Front elements, including pushbuttons, mushroom operators and selector switches, are rated IP 66 for protection against submersion, oil and dirt, making them reliable in the toughest industrial environments. Metal operators are Type 4/13 and Type 4/4X/13 for plastic operators.

Additional Features And Options

• Heavy-Duty Ratings — The D7 line is UL 46E, NEMA A600 and Q600 listed. All components carry a 10 Amp continuous current rating, covering all industrial control needs.
• All Major Approvals — D7 front elements are UL Recognized, while all D7 assemblies are UL Approved. The line is also approved by every major international agency making them ideal for export requirements.
• Special Contact Blocks & Power Modules — Screwless terminals are available for latching and base mounted contacts blocks & Integral LED modules. A new latch-mounted, screw-type dual-circuit contact block is available.
• H-Bridge & Gold Plated Contacts — By doubling the available paths for current to pass through the contacts, the standard H-bridge design provides a cleaner current flow. Gold plated contacts quadruple the current paths for increased contact reliability in low voltage applications.
• Molded Inscription Caps/Diffusers — Abrasion-proof inscription caps/diffusers are offered in a two-color molded design for most common inscription text and symbols used in the industry.
• Laser Engraved Caps/Diffusers — Durable, long-lasting laser-engraved inscription caps/diffusers are offered in a wide variety of ISO symbols and text options. Unlike heat-stamped or ink inscriptions that can wear off, our molded and laser engraved inscription caps withstand repeated use in the harshest environments.
• Touch-Safe — Back of panel components are finger safe, with IP 20 protection.
• Long Lasting Integral LED Assemblies — Our new LED lamps last up to 11 years! They are conveniently offered as a complete unit for all illuminated operators which include the one-piece Integral LED Module. They come in five different colors: amber, blue, green, red and white.
• Full Line of Accessories and Enclosures — A variety of metal and plastic enclosures are available for any application. Replacement components, legend plates and convenient accessories are available from stock, including rings for adapting 30mm holes to fit the 22mm D7 line.

International Standards And Approvals

All Sprecher + Schuh pilot devices are UL-listed and carry the CE mark.