Ingersoll-Rand Xe-145M, Pocket Manual

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MCB2 Phase Monitor Main Circuit Breaker
MCB2 protects K2 Phase Monitor and, in case of a low
voltage condition, opens the control voltage to the
controller terminal P1-1. Cables used to open the
connections are 102-105.
MCB3 Control Voltage Circuit Breaker
MCB3 is a circuit breaker in the 110/120
VAC secondary side of the control
transformer circuit to provide a degree of
protection to the controller terminal P1-1.
MCB4 Low Ambient option Main Circuit Breaker
MCB4 protects the circuit for the thermostat and the
temperature switch contacts if the Low Ambient option
is installed. The heater circuit of MCB4 power supply
must be provided by the customer 120VAC/1
Phase/60HZ.
MCB5 Power Supply Main Circuit Breaker
MCB5 is connected to the control voltage 115VAC and
provides protection to the Power Supply Unit (PSU).
The PSU rectifies 24VDC to power the controller