Overview
The ABB S202U-K20 is a high-performance 2-pole miniature circuit breaker designed for reliable branch circuit protection in industrial automation, motor control, and general-purpose electrical applications. Part of the S200U series, this DIN rail-mounted breaker combines thermal-magnetic tripping with K-curve characteristics to handle moderate inrush currents from inductive loads while maintaining fast short-circuit protection.
Key Features
- 2-pole configuration rated at 20A nominal current
- K-curve thermal-magnetic trip for inductive load protection
- 10 kA standard interrupt rating (branch circuit protection class)
- 240V AC rated voltage
- DIN rail mounting with finger-safe, multi-function terminals
- Compact form factor: 71 mm length × 35 mm width × 92 mm height
- UL 489 and CSA 22.2 No. 5 certified for North American use
Technical Specifications
The S202U-K20 features a delayed thermal tripping mechanism for overload protection and an electromechanic mechanism for short-circuit protection. Operating temperature range is –25 to +55°C. Wire connection accepts 18 to 4 AWG (10 to 2.5 mm²) conductors via screw terminals. The unit features IP20 enclosure rating and 50/60 Hz operation.
Typical Applications
- Industrial machine control circuits and PLC systems
- Motor branch circuits and auxiliary protection
- Transformer and inductive load feeders
- HVAC and process equipment panels
- Backup protection in main distribution boards
- OEM equipment integration and panel building
Compatibility & Replacements
Compatible With
- Standard DIN rail mounting systems (35 mm profile)
- 240V single-phase control circuits
- Industrial control panels and distribution boards
- Legacy and modern ABB System pro M compact installations
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The S202U-K20 is discontinued per distributor records; consult ABB for direct replacement models or upgrade recommendations.
Works With
- DIN-standard control circuit terminals and busbars
- Screw-type wire connections up to 4 AWG
- Standard electrical panel enclosures (IP20 compatible)
- ABB System pro M compact accessory contacts and auxiliary devices
