Overview
The ABB SU203M-K60 is a miniature circuit breaker (MCB) engineered for branch circuit protection in industrial and commercial electrical systems. Built on the proven SU200M platform, this 3-pole breaker combines robust short-circuit protection with high inrush current tolerance, making it ideal for motor control and heavily loaded distribution circuits up to 480Y/277 VAC and 96 VDC.
Key Features
- K-Characteristic Trip Curve — Tolerates higher inrush currents typical of inductive loads and motor startup without nuisance tripping
- 10 kA Interrupt Capacity (UL) — Rated per UL 489 standard for reliable short-circuit protection
- 3-Pole Configuration — Protects all three phases of a 3-phase power circuit simultaneously
- DIN Rail Mounting — Quick, secure installation in standard industrial control enclosures
- Screw Terminal Connections — Accepts 18–4 AWG wire for flexible field wiring
- Wide Operating Temperature — Rated −25 to +55 °C for harsh indoor and outdoor environments
Technical Specifications
The SU203M-K60 delivers consistent performance across a broad voltage range and operating envelope. Its K-trip characteristic is optimized for motor circuits while maintaining fast response to genuine faults. The Class II insulation rating and IP20/IP40 enclosure compatibility ensure safe operation in most industrial settings.
- Rated Voltage: 240 VAC (up to 480Y/277 VAC), 96 VDC
- Frequency: 50/60 Hz
- Trip Curve: K-Characteristic
- Insulation Class: Class II
Typical Applications
The ABB SU203M-K60 excels in applications requiring selective branch protection:
- 3-phase motor control circuits and pump applications
- Industrial machinery and production line power distribution
- HVAC systems and compressor protection
- Machine tool branch circuits with high inrush currents
- Commercial and light industrial panel boards
Compatibility & Replacements
The SU203M-K60 is part of ABB’s modular SU200M family, allowing substitution with other SU200M variants (different trip curves or ratings) in the same DIN enclosure footprint. As a UL 489-certified device, it integrates seamlessly into standard North American industrial control panels. For critical applications, consult ABB compatibility matrices or contact technical support to verify drop-in suitability with legacy breakers.
