5SJ4 Miniature Circuit Breaker 4 Pole DIN Rail MCB for Reliable Circuit Protection

Miniature circuit breakers designed to protect electrical installations from overload and short circuit while enabling easy installation and reliable longterm operation. Key benefits Reliable circuit protection: Thermalmagnetic trip mechanism responds to sustained overloads and instantaneous short circuits to reduce risk of wiring damage and equipment downtime. Flexible compatibility: Available in singlepole, singlepole with neutral, twopole, threepole, and fourpole configurations to suit residential, commercial, and light industrial panels. Spacesaving size: Modular width and DINrail mounting make these breakers suitable for compact distribution boards and retrofits without major panel changes. Clear selection options: Multiple rated currents and trip characteristics allow matching protection to conductors and load types for better nuisance tripping control. Durable construction: Hardened contact materials and flameretardant housing provide consistent operation over repeated cycles and long service life. Main features and specifications Function: Thermalmagnetic tripping for overload and shortcircuit protection; manual ON/OFF switching with visible position indicator. Rated current range: Commonly available from 1 A up to 63 A to cover a wide range of branch circuit requirements. Pole configurations: 1P, 1P+N, 2P, 3P, 4P for singlephase and threephase systems. Trip curves: Typical B, C, and D characteristics for protection of resistive, mixed, and inductive loads respectively. Breaking capacity: Options for common breaking capacities suitable for typical distribution systems. Mounting: 35 mm DINrail mounting for fast installation and secure retention. Housing material: quality thermoplastic for mechanical strength and electrical insulation. Terminals: Screw or clamp terminals designed for solid and stranded conductors with clear torque guidance. Operating temperature range: Suitable for normal indoor electrical installation environments. Why customers choose this type of breaker Minimizes downtime by isolating faults quickly and predictably. Reduces risk of conductor and device damage from prolonged overloads. Simplifies panel layout with compact modular design and standardized mounting. Matches diverse loads through selectable trip characteristics and current ratings. Practical applications Residential distribution boards: Protect lighting, socket circuits, and appliances in apartments and houses while preserving panel space. Small commercial and office installations: Separate and protect HVAC, lighting, and general power circuits in retail and office spaces. Light industrial control panels: Provide branch protection for motors, control circuits, and equipment feeders when combined with appropriate upstream protection. Installation and selection tips Choose the correct rated current based on conductor size and expected continuous load to avoid nuisance tripping. Select trip curve B for mainly resistive loads, C for mixed loads with moderate inrush, and D for inrush equipment such as motors and transformers. Verify pole configuration matches supply type and neutral requirements for the circuit. Ensure terminal tightening follows specified torque values to maintain reliable connections. What is included Single unit miniature circuit breaker with manual toggle and mounting clip. Standard packaging for protection in transit. This miniature circuit breaker provides a practical balance of compact size, selectable performance, and straightforward installation for protecting branch circuits in a wide range of electrical installations.