Products

Motor Protection

Motor Protection — Obsolete

CEF1 Electronic Motor Protection

Solid state technology means highly accurate protection when it matters most

Sprecher + Schuh's CEF1 electronic motor protection relay utilizes solid state technology to provide accurate thermal overload protection, even under the most rigorous starting conditions.

Where a conventional thermal overload relay mechanically simulates the heat build-up in the motor (using bi-metal elements), the CEF1 electronically simulates heat build-up using more precise and reliable solid state technology. The CEF1 monitors actual motor current through integrated current transformers. By combining the elements of time and current, the solid state electronics provide a very accurate simulation of heat build-up in the motor. Consequently, shutdown of the motor occurs when the maximum allowable time/current limits have been reached.

Features

• Thermal overload protection
• Single phase protection
• Phase imbalance protection
• Overcurrent indication
• Thermistar over-temperature protection

Many standard features

Only three relay sizes provide a wide application range from 0.5 to 630 amperes. Digital slide switches provide very precise setting of both motor full load amps and desired trip time. Many other features are standard, including phase-unbalance protection and a test button that functionally simulates an actual overload.

Adjustable degree of inertia

Tripping time is adjustable in 2 second increments, from 2 to 30 seconds. This makes the device very adaptable to protecting special motors under maximum loading conditions.

Convenient options

Automatic reset after a thermal overload trip is an available option on all CEF1 units. All units may also utilize the CEL1 remote reset module for manual reset of a trip.