Configured for precise motor thermal protection and current monitoring within industrial control panels, the Allen-Bradley 193-EF1A (193-EF Overload Relay) provides direct physical/electrical execution. Operating as a basic version solid-state overload relay within the Bulletin 193-EF series, this unit features a selectable current trip adjustment range of 20 to 180 A. The device directly monitors 3-phase motor currents through integrated current transformers, providing reliable trip execution and phase-loss detection without reliance on thermal bi-metallic heating elements.
Hardware Specifications
Parameter
Specification
Model
193-EF1A
Brand
Allen-Bradley
Origin
USA / Global Manufacturing
Weight
2.29 lbs (1.04 kg)
Dimensions
Standard Bulletin 193-EF Frame Size
Operating Temp
-20 to 60 deg C
Power Consumption
Self-powered / Low-power internal electronics
Product Series
Bulletin 193-EF Series
Version
Basic Version
Current Adjustment Range
20 to 180 A
Mounting Type
Direct Contactor Mount / Panel Mount
Backplane Synchronization & Network Interfacing
The Allen-Bradley 193-EF1A incorporates solid-state current sensing circuitry designed to maintain steady operational stability across fluctuating motor loads. The module logic processes current feedback to maintain precise trip curves, supporting backplane bus communication velocity when paired with optional network communication side-modules across EtherNet/IP networks. Onboard signal filtering prevents false tripping caused by transient electrical noise or harmonic distortion in motor branch circuits.
Frequently Asked Questions
Q: What is the current adjustment range supported by this solid-state overload relay?
A: The 193-EF1A features an adjustable dial supporting a full-load current (FLA) trip range of 20 to 180 A.
Q: Does this basic version require an external control power supply to operate its protection logic?
A: No, the basic version utilizes internal current transformer coupling from the primary motor phases to power its internal protection logic and trip outputs.
Field Installation Guidelines
Mount the overload relay directly to the load side of the designated Bulletin 100 contactor or utilize a separate panel-mounting bracket. Route all three motor phase conductors through the integral current transformer pass-through windows, ensuring proper wire positioning. Connect control circuit trip and alarm contacts using copper conductors rated for 75 deg C or higher, torquing terminal screws to specified manufacturer values. Ensure the enclosure ground terminal is bonded to the main panel earth bus to suppress transient electrical noise.
