Allen-Bradley 1492-SP1C030 Bulletin 1492-SP Miniature Circuit Breaker

Configured for overcurrent protection in control circuit branches, the Allen-Bradley 1492-SP1C030 (1492-SP1C030 Circuit Breaker) provides direct physical/electrical execution of single-pole circuit interruption under overload and short-circuit conditions.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The 1492-SP1C030 employs a C-curve trip characteristic, providing a targeted response to moderate inrush currents while maintaining sensitivity to sustained overloads. In modular automation architectures, effective I/O density scaling relies on coordinating these protective devices with upstream distribution blocks to prevent nuisance tripping across deterministic communication segments. This component does not interface directly with fieldbus networks; however, the mechanical trip mechanism is engineered to ensure high-speed disconnection during fault transients, thereby protecting downstream I/O modules and backplane bus segments from severe current surges.

Frequently Asked Questions

Q: Does this circuit breaker support field-installable accessories?

A: The Bulletin 1492-SP series supports the installation of various accessories, including auxiliary contacts and signal switches, which mount to the side of the breaker to provide status indication to the PLC.

Q: Is this device intended for direct motor protection?

A: No. This device is a supplementary protector and is rated for control circuit protection. It is not designed to serve as a motor branch circuit protector or to provide the thermal overload protection required for motor drives.

Field Installation Guidelines

1. Install the breaker onto a standard 35 mm DIN rail; ensure the base latch is fully secured to prevent vibration-induced movement.
2. Connect the line-side power supply to the top terminals and load-side wiring to the bottom terminals, verifying consistent wire gauge application.
3. Apply correct tightening torque to terminal screws to maintain low-impedance electrical contact and prevent thermal degradation of the connection point.
4. Separate secondary control wiring from primary power cabling or variable frequency drive (VFD) output lines to mitigate electromagnetic noise coupling.
5. Ensure the surrounding enclosure provides adequate ingress protection and that the device remains clear of conductive dust or debris.
6. Verify circuit operation by measuring voltage at the load-side terminals with the device in the "ON" position to confirm functional continuity.