M-3420

M-3420 Generator Protection System

Please Note: As of 12/31/2022, Beckwith Electric will no longer be manufacturing the M-3420 Generator Protection System.

Beckwith will accept orders for these products until 8/31/2022 and all products ordered must ship before 12/31/2022.
Please contact us to request a quote and place orders.
This product may have an alternative replacement product, M-3425A, depending on your application needs. Please contact us for details.

Microprocessor-based Generator Protection system provides 17 protective relay functions
Individually programmable input contacts can be programmed to activate any one of eight output contacts
Local and remote communications capability for both monitoring and control functions

Protective Functions

Overexcitation (V/Hz) protection (24)
Phase Undervoltage protection (27)
Sensitive dual-setpoint, reverse power detection suitable for sequential tripping (32)
Dual-zone, offset-mho loss-of-field protection (40)
Sensitive negative-sequence overcurrent protection and alarming (46)
Instantaneous overcurrent (50) protection
Inadvertent generator energizing protection (50/27)
Generator breaker failure protection (50BF)
Neutral inverse time overcurrent (51N)
Instantaneous overcurrent (50N) protection
Three-phase inverse time overcurrent (51V)
Phase overvoltage (59)
Generator ground fault protection (59N)
VT fuse-loss detection and blocking (60FL)
Four-step over/underfrequency protection (81)
Generator phase differential (87)
Ground differential (87GD) protection