Schneider MT25H1

1. Product Overview

The MT25H1 series is a molded case low-voltage circuit breaker launched by Schneider Electric, mainly designed for power distribution systems. Featuring high reliability, cost-effectiveness and easy maintenance, it stands as one of the commonly used protective switches in industrial power distribution and building power distribution systems.

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2. Technical Parameters

Parameter	Specification
Rated Current (In)	5A / 10A / 16A / 20A / 25A / 32A / 40A / 50A / 63A / 80A / 100A / 125A / 160A / 200A / 250A
Rated Operating Voltage	AC 600V
Pole Number	3P, 4P (common types); 3P/4P D/O (double pole/single pole) types are also available
Rated Short-Circuit Current	6kA / 10kA / 22kA / 35kA (selected according to model and junction box)
Overload Breaking Capacity	0.5 times rated current / 10 seconds (typical value)
Dimensions	90mm (W) x 167.2mm (H) x 118.7mm (D) (subject to molded case)
Weight	Approx. 0.5kg - 1kg (varies depending on pole number)
Insulation Level	Class B (suitable for 200-240V AC systems)

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3. Product Features

• High Reliability & Safety: Adopts high-performance magnetic overcurrent protection principle, which can quickly cut off fault currents to protect circuits and electrical equipment from damage. It effectively avoids electrical hazards caused by short circuits and overloads, ensuring stable operation of the entire power distribution system.
• Easy Installation & Maintenance: Boasts a standardized design that is compatible with Schneider’s common molded case junction boxes (such as E3A, E3H, E3S series). The plug-and-play structure enables quick replacement and disassembly, greatly simplifying daily maintenance and replacement operations, reducing downtime for equipment maintenance.
• Compact Size: Compared with traditional independent circuit breakers, the molded case circuit breaker has a smaller footprint, saving valuable installation space in distribution boxes and making it ideal for compact power distribution cabinets and narrow installation scenarios.
• Double Pole/Single Pole (D/O) Function: Partial models support the D/O function, realizing double pole or single pole disconnection as needed. This flexible disconnection mode meets the special wiring and protection requirements of customized circuits, expanding the product’s application scenarios.
• Rich Accessory Compatibility: Supports a variety of additional components, including tripping indicators, auxiliary contacts, branch overcurrent relays and more. Users can flexibly assemble these accessories to meet diverse control, monitoring and protection requirements, adapting to different industrial and building power distribution needs.

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4. Structure & Components

• Main Contact System: Consists of main contacts, a quenching chamber and arc extinguishing plates. The main contacts are responsible for normal current switching on and off, while the quenching chamber efficiently extinguishes arcs generated during current interruption, preventing arc damage to internal components and extending service life.
• Magnetic Protection Element: Acts as the core component for short-circuit protection, enabling rapid circuit disconnection instantly when overcurrent (short-circuit) faults occur, minimizing fault impact on the power distribution system and connected equipment.
• Thermal Overload Protection Element: Monitors long-term operating current in real time, and triggers circuit disconnection in case of prolonged overload (such as motor starting overload, continuous heavy load operation), avoiding equipment burnout caused by overheating.
• Operating Mechanism: Comprises a handle, shift lever and paddle, supporting manual closing/tripping operations. The mechanism features smooth action and stable performance, facilitating manual operation and emergency control of the circuit breaker.
• Terminal Block: Designed for connecting bus bars or cables inside the distribution box, with stable wiring performance and good conductivity, ensuring reliable power transmission and avoiding poor contact failures.

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5. Typical Application Areas

• Building Power Distribution Systems: Widely used in secondary distribution boxes of residential buildings, office buildings, shopping malls and other construction scenarios, providing reliable protection for branch circuits and electrical equipment, ensuring safe power consumption for daily life and office work.
• Industrial Power Distribution: Applied to distribution boxes in production workshops, protecting large electrical equipment such as motors, transformers and control cabinets. It adapts to harsh industrial operating environments and meets the high-standard protection needs of industrial production lines.
• Power Automation: Serves as a key protective component in power distribution automation systems, supporting remote monitoring and control functions. It integrates with intelligent power distribution systems to realize automated fault detection and circuit protection, boosting the intelligence level of power distribution management.

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