Overview
The Allen-Bradley 595-AB is a compact auxiliary contact block for industrial motor control and automation systems. As part of the Bulletin 500 series, this Allen-Bradley 595-AB auxiliary contact provides reliable signal switching for interlocking, status indication, and control logic in NEMA-rated electrical enclosures. Its 1NO/1NC (1 Normally Open, 1 Normally Closed) contact configuration makes it ideal for dual-state control requirements.
Key Features
- 1NO/1NC Contact Configuration: Combines one normally open and one normally closed contact for flexible control logic and interlocking
- NEMA Size 0-5 Compatible: Mounts directly on Bulletin 500 series starters and contactors without additional wiring modifications
- 10A at 600V Rated: Handles standard industrial AC control voltages with margin for switching loads
- Screw Terminal Type: Reliable, tool-friendly connections support both copper and aluminum conductors
- Base Mounting: Simple, plug-in design minimizes installation time and reduces wiring errors
- UL/CE/CUL Certified: Meets North American and international safety standards for industrial control equipment
Technical Specifications
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model Number | 595-AB |
| Product Type | Auxiliary Contact Block |
| Series | Bulletin 500 Line |
| Contact Configuration | 1 Normally Open / 1 Normally Closed (1NO/1NC) |
| NEMA Size Range | 0–5 |
| Rated Voltage | 600V AC |
| Rated Current | 10 Amps |
| Mounting Type | Base Mount (Plug-in) |
| Terminal Type | Screw |
| Weight | 0.15 lbs |
| UPC Code | 781180156427 |
| Certifications | UL, CE, CUL, KC |
| Condition | New in Box |
Typical Applications
- Motor starters and contactor status feedback in HVAC systems
- Interlock logic for multi-motor coordination in pumping and compressor stations
- Pilot light and alarm signal circuits for machine tool control panels
- Auxiliary switching in industrial automation, assembly line conveyors, and material handling equipment
- Control circuit extensions for NEMA Size 0-5 electrical starters without full relay replacements
Compatibility & Replacements
Compatible With
- Allen-Bradley Bulletin 500 series AC contactors and motor starters (NEMA Sizes 0–5)
- NEMA Size 0 through Size 5 definite-purpose and general-purpose starters
- Standard 600V AC control circuits with screw-terminal wiring
- Industrial control enclosures with base-mounted auxiliary contact slots
Replaces / Drop-In Replacement For
- Earlier revisions of the 595-AB auxiliary contact
- Legacy auxiliary contact blocks requiring 1NO/1NC configuration on Bulletin 500 starters
- Verify compatibility with your specific contactor model before ordering
Works With
- Bulletin 500 series AC contactors (open-frame and encapsulated)
- NEMA-rated motor starters and combination starters
- Hardwired control logic and PLC input modules via 600V AC pilot circuits
- Standard industrial 120V AC and 600V AC control signal chains
