M-4172 and M-4272 Comparison
M-4172 and M-4272 Comparison
Two Models… Same Performance!
The M-4172 and M-4272 Digital High Speed Motor Bus Transfer System addresses fast (high-speed sync-check), in-phase (high-speed synchronizing), residual (undervoltage), fixed time transfer and manual transfer applications. With Beckwith Electric’s MBT System, all methods are running in parallel, to ensure the best method is used.
Learn more about the differences between the M-4172 and M-4272 below.
M-4272
Digital Motor Bus Transfer System for Medium Voltage (MV) and Low Voltage (LV) Switchgear Applications
Application
M-4172
More economical and affordable device designed for Low Voltage switchgear motor bus transfer applications typically found in large industrial and petrochemical facilities.
M-4272
Designed for both Medium Voltage and Low Voltage switchgear motor bus transfer applications in all industry types and utilities.
Inputs
M-4172
6 Inputs
2 dedicated inputs for S1 and S2 breaker status contacts: 52a or 52b
4 programmable inputs
M-4272
18 Inputs
6 dedicated inputs for S1 and S2 breaker status contacts: 52a, 52b and 52sp (TOC)
12 programmable inputs
Outputs
M-4172
8 Outputs
5 dedicated outputs for Trip & Close S1 breaker, Trip & Close S2 breaker and Lockout/Blocking Alarm
3 programmable outputs
M-4272
16 Inputs
5 dedicated outputs for Trip & Close S1 breaker, Trip & Close S2 breaker and Lockout/Blocking Alarm
11 programmable outputs
Power Supply
M-4172
1 standard power supply
1 optional redundant power supply
M-4272
2 standard power supplies
Trip/Close Circuit Monitors
M-4172
No Trip/Close Circuit Monitors
M-4272
Includes Trip/Close Circuit Monitors
Size (Height)
M-4172
5.21 inches (3 Rack Units)
M-4272
6.96 inches (4 Rack Units)
Communications Software
M-4172
Includes M-3871 ISScom
M-4272
Includes M-3872 ISScom