MJS6-40B ABB Miniature Circuit Breaker MCB High-performance
single-pole miniature
Product Overview
The ABB MJS6-40B is a single-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 lighting circuits, socket branches, control
power supplies and terminal distribution boxes, providing efficient
and reliable electrical safety guarantees for circuits and loads.
Key features
✅ high judgment ability
The rated operating short-circuit breaking capacity is as high as 6
kA (230 V AC), meeting the requirements of most 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 for a long time
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 18mm (1P), meeting the modular power distribution
standard
Standard 35mm DIN rail mounting, compatible with all mainstream
distribution boxes
✅ 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 flexible to expand
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 added (some functions need to be used in conjunction
with multiple poles).
Basic parameters
Model MJS6-40B
Series ABB S200 series miniature circuit breakers
Pole number 1P (single pole, only phase line L disconnected)
Rated current (In) 40A (fixed value)
Rated working voltage (Ue) 230 V AC (50/60 Hz)
Rated insulation voltage (Ui) : 500 V AC
Trip characteristic Type B (suitable for low starting current
equipment)
• Type B: 3-5 In (suitable for lighting and electronic equipment)
Rated short-circuit breaking capacity (Icn/Ics) : 6 kA @ 230 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)
Protection grade IP20 (front)
Operating temperature range: -25°C to +55°C
Dimensions (width × height × depth) : 18mm × 82mm × 77mm
Weight ≈ 0.1 kg
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.
Product Images
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