Overview
The Eaton Cutler-Hammer J20 is a Type-J NEMA auxiliary contact block designed for integration with A200 and A900 series contactors and motor starters in industrial control systems. This 2NO (normally open) module provides critical signal switching and interlocking functionality in motor control, pump stations, compressor systems, and similar applications requiring reliable auxiliary contact switching.
Key Features
- 2 Normally Open (2NO) contacts for flexible circuit logic
- Field-mountable on contactor and starter sizes 00–6
- Compatible with A200 and A900 series equipment
- Robust NEMA-rated contact construction
- Proven Cutler-Hammer quality and reliability
- Compact, lightweight design (0.1 lbs)
Technical Specifications
- Contact Configuration: 2 Normally Open (2NO)
- AC Voltage Rating: 28–600 VAC
- AC Contact Ratings (Make/Break): 72–120 VAC make; 28–72 VAC break
- DC Voltage Rating: 20–300 VDC
- Current Rating: 10 A (standard auxiliary contact rating)
- Compatible Contactor Sizes: NEMA 00, 01, 02, 03, 04, 05, 06
- Terminal Screw Torque: 8–12 lb-in
- Copper Wire Size: 16–12 AWG (one or two contactors per terminal)
- Weight: 0.1 lbs
- Mounting: Side or top mount (field-installable)
Typical Applications
The J20 auxiliary contact is widely used in:
- Three-phase motor control circuits and reversing starters
- Pump and compressor motor interlock schemes
- Status and pilot light circuits
- Hard-wired contactor interlocking systems
- Industrial machinery and process control panels
- HVAC and refrigeration equipment controllers
- Manual and automatic starter assemblies
Compatibility & Replacements
Compatible With
- Eaton A200 series contactors and motor starters
- Eaton A900 series contactors and starters
- NEMA-standard control circuits (120–600 VAC, 20–300 VDC)
- Reversing motor starter assemblies
- Direct-on-line (DOL) and soft-start control systems
Replaces / Drop-In Replacement For
- Westinghouse J20 auxiliary contacts (mechanical equivalent)
- Verify specific application compatibility with your system integrator before ordering to ensure proper terminal configuration and mounting orientation.
Works With
- Eaton A200, A201 contactor series
- NEMA motor control relay and contactor platforms
- IEC-equivalent auxiliary contact modules (with voltage/current verification)
- Standard hardwired control logic circuits
