ABB SmiSSline, S400, FS401 S400M Miniature Circuit Breaker, 3-Pole, 25 A, Type K, Type D, Type C, Type B, 400 V AC, 250

RS Stock No.:: 176-324
Mfr. Part No.:: 2CCS573001R0255 S403M-B25
Brand:: ABB

ABB SmiSSline, S400, FS401 S400M Miniature Circuit Breaker, 3-Pole, 25 A, Type K, Type D, Type C, Type B, 400 V AC, 250

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Subtotal (1 unit)*

£98.84

(exc. VAT)

£118.61

(inc. VAT)

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Shipping from 19 February 2026

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Units	Per unit
1 +	£98.84

*price indicative

RS Stock No.:: 176-324
Mfr. Part No.:: 2CCS573001R0255 S403M-B25
Brand:: ABB

Specifications

Technical Reference

Legislation and Compliance

Product Details

Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	ABB
	Product Type	Miniature Circuit Breaker
	Number of Poles	3
	Current Rating	25 A
	Tripping Characteristics	Type K, Type D, Type C, Type B
	Rated AC Voltage	400 V
	Rated DC Voltage	250 V
	Mount Type	DIN Rail
	Range	SmiSSline, S400, FS401
	Series	S400M
	Depth	75mm
	Standards/Approvals	IEC/EN 60947-2, EN 60898-1
	Width	54 mm
	Reset Actuator Type	Toggle Switch

	Select all
	Brand ABB
	Product Type Miniature Circuit Breaker
	Number of Poles 3
	Current Rating 25 A
	Tripping Characteristics Type K, Type D, Type C, Type B
	Rated AC Voltage 400 V
	Rated DC Voltage 250 V
	Mount Type DIN Rail
	Range SmiSSline, S400, FS401
	Series S400M
	Depth 75mm
	Standards/Approvals IEC/EN 60947-2, EN 60898-1
	Width 54 mm
	Reset Actuator Type Toggle Switch

COO (Country of Origin):: CH

ABB S400M Series MCB, 3 Poles, 25A Current Rating - S403M-B25

This miniature circuit breaker (MCB) is designed for effective electrical protection in commercial and industrial environments. With dimensions of 54mm in width, 91mm in length, and a depth of 75mm, this 3-pole MCB ensures safety against overloads and short circuits.

Features & Benefits

• Delayed thermal tripping mechanism for overload protection

• Electromechanical tripping for consistent short-circuit response

• High breaking capacity of 10kA for enhanced safety

• DIN Rail mount for quick and easy installation

Applications

• Applied in small industrial control panels to protect circuits for equipment such as pumps and fans

• Employed in commercial distribution boards to provide reliable circuit protection for various electrical applications

What type of circuits is the B-type tripping characteristic suitable for?

The B-type characteristic is ideal for circuits with moderate inrush currents, reducing the chance of nuisance tripping

Is it appropriate for harsh environments?

It operates effectively in temperatures from -25°C to 60°C.

Does it comply with international standards?

Yes, it conforms to IEC/EN 60898-1 and IEC/EN 60947-2.