ABB SH203 Miniature Circuit Breaker MCB with 10 kA Breaking Capacity High

Product Specification

SH203 ABB Miniature Circuit Breaker MCB High performance three pole circuit protection safe reliable

Product Overview

ABB SH203 is a 3-pole Miniature Circuit Breaker (MCB) in the ABB S200 series, specifically designed for overload and short-circuit protection in residential, commercial and light industrial power distribution systems. This product adopts a thermal-magnetic tripping mechanism, featuring high breaking capacity, compact structure and outstanding electrical performance. It is widely used in three-phase distribution circuits, motor control, building terminal boxes and OEM equipment, providing efficient and reliable electrical safety guarantees for lines and loads.

Key features

✅ high judgment ability

The rated operating short-circuit breaking capacity is as high as 10 kA (400 V AC), meeting the requirements of the vast majority of civil and light industrial application scenarios.
✅ thermal and magnetic dual protection mechanism

Thermal trip: The bimetallic strip senses the continuous overload current and acts with a delay to prevent the cable from overheating and aging
Magnetic trip: The electromagnetic coil responds instantaneously to the short-circuit current (5 to 10 times the rated current), quickly cutting off the faulty circuit
✅ compact modular design

The width is only 3 × 18mm = 54mm (3 poles)
Standard 35mm DIN rail mounting, compatible with all mainstream distribution boxes and control cabinets
✅ certified globally, safe and compliant

Compliant with IEC/EN 60898-1 (for household and similar use) and IEC/EN 60947-2 (for industrial use)
Passed international authoritative certifications such as CE, CCC, TUV, UL Recognized (for some models)
✅ is intuitive to operate and highly scalable

A clear ON/OFF position indicator window
Supports padlock locking (optional accessories required)
Auxiliary contacts, alarm contacts, shunt trip units and other modules can be flexibly installed

Basic parameters
Model SH203
Series ABB S200 series miniature circuit breakers
Number of poles 3P (three poles)
Rated current (In) 0.5-63A (Common specifications: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A)
Rated working voltage (Ue) : 400 V AC (50/60 Hz)
Rated insulation voltage (Ui) : 500 V AC
The tripping feature types B, C and D are available for selection
• Type B: 3-5 In (suitable for lighting and electronic equipment)
• Type C: 5-10 In (Universal type, suitable for motors, sockets, etc.)
• Type D: 10-20 In (Suitable for high starting current equipment, such as compressors)
Rated short-circuit breaking capacity (Icn/Ics) : 10 kA @ 400 V AC
The mechanical life is ≥ 20,000 operations
Electrical life ≥ 10,000 times (at rated current)
Installation method: 35mm DIN rail (compliant with EN 60715)
Both the upper and lower terminals support screw crimping. Applicable wire cross-sectional area: 0.5-25 mm² (copper wire)

Typical application scenarios
Industrial automation
It is used for the starting, stopping and protection of medium-voltage motors, such as water pumps, fans, compressors and other equipment.
Power transmission and distribution
Load switching and protection in scenarios such as medium-voltage switch cabinets and substations.
Energy and infrastructure
Auxiliary control of photovoltaic inverters, pumping stations of water treatment plants, and backup power switching systems.
OEM equipment integration
As a standard component embedded in the OEM control cabinet, it enhances the reliability of the entire machine.

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