193-EIO-43-120 | Allen-Bradley E300 Control Module, 4 Inputs / 3 Relay Outputs, 120V AC

The 193-EIO-43-120 is an overload relay designed by Allen-Bradley for use with motor protection circuits. It is part of the Bulletin 193-EIO series and is typically used in industrial applications to protect electric motors from overload conditions. It monitors the motor's current and interrupts the circuit if the current exceeds a pre-set value for a specified period of time.

The primary purpose of the 193-EIO-43-120 overload relay is to protect motors from damage due to excessive current, which can occur during conditions like motor jams, excessive load, or mechanical failure. It provides the following functions:

• Overload Protection: Monitors the motor current to detect overloads and trips the relay if an overload condition is detected.
• Thermal Protection: Simulates the thermal stress on the motor and protects it from sustained overload conditions.
• Manual Reset: After tripping, the relay can be reset manually to restore the system.

Wiring the 193-EIO-43-120 involves the following steps:

1. Power Supply: Ensure the relay is wired to the correct power supply, which should be a 120V AC supply.
2. Motor Connections: Connect the relay's motor terminals to the motor contactor or directly to the motor circuit.
3. Current Sensing: The relay uses current transformers (CTs) to sense motor current. These sensors are typically connected to the relay to monitor the current flowing to the motor.
4. Reset and Alarm Connections: The relay may have manual reset terminals (to reset the overload protection) and alarm output contacts (for signaling faults). These should be properly wired based on the system requirements.

Refer to the wiring manual for detailed connection diagrams and terminal information.

To wire the 193-EIO-43-120 with an external contactor:

1. Connect the input terminals of the overload relay to the motor control circuit (the contactor's motor terminals).
2. Wire the output contacts of the relay to the contactor's coil for trip signals.
3. The overload relay will open the contactor when an overload is detected, cutting off power to the motor.
4. If the relay is equipped with alarm contacts, wire them to indicate a fault condition.

Refer to the wiring manual for specific wiring diagrams and connection details.

The 193-EIO-43-120 overload relay supports a wide full-load current (FLC) range of 0.5 A to 43 A. This makes it suitable for a variety of motors, from small to medium-sized industrial motors. Always ensure the relay’s current range is appropriate for the motor it is protecting.