Motor Protection — Obsolete
CEP7 Solid State OL Relays/1st Generation
Advanced solid state motor protection at electromechanical prices
Provides increased accuracy & faster response time with onboard electronics
Sprecher + Schuh is at the leading edge of technology developing affordable solid state overload relays that utilize the latest Application Specific Integrated Circuits (ASICs) in their construction. This gives our new CEP7 overload relay many features that are simply not possible with traditional bi-metallic or eutectic alloy electromechanical overload relays.
Superior phase failure protection
The CEP7's on-board electronics are constantly monitoring all three phases. If the ASIC board senses that one phase is missing during a steady state running condition on a 100% loaded motor, it will trigger in 2 seconds; and from 2 - 3 seconds on a lightly loaded motor. These times are much faster than any electromechanical overload relay.
Conventional overload relays dissipate as much as six watts of energy compared with as little as 150 milliwatts for the CEP7
Increased accuracy and improved motor 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 loss of phase more accurately, and react to the condition with greater speed and reliability than traditional overload relays.
Wide current adjustment range
CEP7 overload relays have a very wide current adjustment range (3.2 to 1) compared to conventional bi-metallic overload relays with a typical range of 1.5 to 1.
Choice of tripping classes...
Because of 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, however, a Class 20 version of the CEP7 is available in all amp ranges.
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.
International Standards and Approvals
All Sprecher + Schuh CEP7 solid state overload relays are UL-listed and CSA-approved. They also carry the CE mark.