Description
The ABB 91A020 is a high-reliability auxiliary contact block designed for front-mounting on ABB contactors. It provides additional signaling and interlocking capabilities for motor control circuits, allowing for the status of the main contactor to be communicated to PLCs, pilot lights, or other control logic components.
Technical Parameters
- Model: 91A020
- Contact Configuration: 2 NO (Normally Open)
- Rated Operational Voltage: 690V AC / 250V DC
- Rated Operational Current (AC-15): 4A at 230V
- Conventional Free-air Thermal Current: 10A
- Minimum Switching Capacity: 17V / 5mA
Product Specifications
- Mounting Type: Front-side snap-on mounting
- Terminal Type: Screw clamp terminals
- Wire Size Capacity: 0.75mm² to 2.5mm² (Solid or Stranded)
- Mechanical Durability: Up to 10 million operating cycles
- Degree of Protection: IP20 (Finger-safe terminals)
- Compatibility: A-Series (A9 to A110) and AF-Series contactors
Application Areas
- Motor starter status feedback to DCS/PLC
- Electrical interlocking in forward/reverse starters
- Safety circuit monitoring and signaling
- Control panel logic and sequence automation
- HVAC and pump system control coordination
Product Q&A
- Q: Can the 91A020 be used with DC-operated contactors?
- A: Yes, it is compatible with both AC and DC versions of the A and AF series contactors as long as they support front-mounted accessories.
- Q: Does this block require tools for installation?
- A: No, it features a tool-free snap-on design for the contactor front, though a screwdriver is required for the terminal wiring.
- Q: Is it possible to stack multiple blocks on one contactor?
- A: The number of blocks depends on the specific contactor frame size; typically, one 2-pole or 4-pole block is mounted centrally on the front.
