Federal Pacific Electric USD-21 (LI) Solid-State Overcurrent Relay
The FPE FPE-USD-21-CSD-20 is a microprocessor-based USD-21 (LI) solid-state overcurrent relay providing LI protection for Class 2810 Type H-3 and HL-3 air circuit breakers. Rated for 800-2000 current range with factory-calibrated thumbwheel switches for precise setting adjustment.
Protection Features
Provides LI overcurrent protection elements. USD-21 relay, LI protection, CSD-20 sensor compatible, thumbwheel calibration. Compatible with Compatible with 2000A frames. Plug-in mounting for easy field replacement and testing.
Applications
Replacement or upgrade overcurrent relay for FPE Class 2810 H-3/HL-3 air circuit breakers with CSD-20 sensors.
