MCB 4.5KA 1P DIN Rail Miniature Circuit Breaker

In residential buildings, commercial spaces, and light industrial workshops, branch circuit protection is essential for preventing electrical overloads and short circuits. This MCB 4.5KA 1P DIN Rail Miniature Circuit Breaker is a standard modular low-voltage miniature circuit breaker designed for terminal power distribution systems. Built in conformity with the IEC 60898 standard, it offers dependable overcurrent protection and infrequent circuit switching under normal working conditions. For additional models, explore our Miniature Circuit Breaker product range.

Operating on AC 50Hz/60Hz power lines with a rated voltage of 230V for single-pole circuits (and up to 400V for multi-pole networks), this single pole 4.5kA MCB features a thermal-magnetic mechanism that combines bimetal overload protection with magnetic instantaneous short-circuit tripping. With standard 18mm modular pole width and DIN rail mounting, it provides a practical solution for electrical contractors, panel assemblers, and wholesale distributors.

Key Features & Construction Highlights

Designed for dependable performance, easy installation, and commercial affordability, this MCB features a balanced structural design:

● Standard Thermal-Magnetic Tripping: Dual-action protection combining an inverse-time bimetallic strip for overload response and an electromagnetic coil for rapid short-circuit disconnection.

● Effective Arc Quenching Chamber: The 1P miniature circuit breaker 4.5kA is equipped with a multi-plate de-ionizing arc chute that splits and cools electrical arcs during fault interruptions.

● Flame-Retardant Engineering Enclosure: Molded from flame-retardant engineering plastic with good electrical insulation, heat resistance, and impact durability for standard distribution enclosures.

● Bi-Stable DIN Rail Clip: Designed with a sturdy mounting latch for quick, tool-free snap-on installation onto standard 35mm symmetrical DIN rails.

● Reliable Tunnel Clamp Terminals: Screw-clamped tunnel terminals provide solid connection for solid or stranded copper conductors up to 25mm².

● Clear Operational Markings: High-legibility front markings indicating rated current, operational voltage, breaking capacity, and connection schematics.

Technical Specifications & Performance Data

Electrical and mechanical specifications based on IEC 60898 testing requirements:

Over-Current Tripping Characteristics

IEC 60898, Reference Temperature: 30°C ± 2°C

Conductor Sizing Guide

Copper Conductors

Typical Applications & Installation Scenarios

This MCB 4.5KA 1P DIN Rail Miniature Circuit Breaker is designed for standard commercial, residential, and industrial sub-distribution networks:

● Residential Power Distribution: Main lighting branch lines, domestic socket circuits, water heaters, and household consumer units.

● Commercial Buildings & Shops: Retail store distribution boxes, office lighting panelboards, and small commercial electrical cabinets.

● Industrial & Workshop Distribution: Auxiliary machinery control power, small motor lines, and secondary circuit isolation.

● Construction & Temporary Site Power: Power distribution panels for temporary worksite lighting and utility power supply.

Standards, Certifications & Factory Quality Control

Our MCB 4.5KA 1P DIN Rail Miniature Circuit Breakers are manufactured according to standard industrial quality procedures and applicable electrotechnical standards:

● Compliance Standards: IEC 60898, GB 10963.

● Product Certifications: CE Marking, CCC Certification.

● Quality System: Produced under standardized factory quality management routines.

Learn more about our product certificates and factory workshop.

Standard Factory Inspection & Testing Routine

● Incoming Raw Material Check: Verification of copper conductors, stamped metal parts, bimetals, and plastic molding materials.

● Assembly Line Verification: Proper placement of arc chutes, contact levers, and magnetic trip coils.

● Thermal Tripping Inspection: Calibration testing under simulated overload currents to verify tripping action.

● Instantaneous Trip Testing: Pulse testing to verify instantaneous tripping under short-circuit thresholds.

● Dielectric Strength Check: Standard insulation withstand voltage verification between poles and to ground.

● Visual & Packaging Inspection: Verification of markings, terminal screws, inner box packing, and export labels.

Sourcing & Manufacturing Advantages

For electrical importers, wholesalers, and panel builders seeking modular circuit breakers, the following product and supply considerations are important:

Installation, Wiring Guidelines & Maintenance

● Mounting: Snap onto standard 35mm symmetrical DIN rail (IEC 60715). Ensure the latch is securely engaged.

● Conductor Stripping: Strip wire insulation cleanly (approximately 10–11 mm) without damaging the conductor strands.

● Wiring Connection: Insert the conductor into the terminal chamber and tighten the terminal screw to the recommended torque.

● Operational Check: Manually toggle the handle ON and OFF several times before powering the circuit to confirm smooth mechanical operation.

● Routine Maintenance: Periodically check terminal screw tightness in distribution boards to maintain good electrical contact.

Installation and electrical maintenance should be performed by qualified personnel in accordance with applicable electrical safety regulations.

Export Packaging & Shipping Specifications

Standard export packaging designed for international freight transport:

Global Export Experience & Customer Cooperation

When selecting a miniature circuit breaker supplier, distributors and electrical contractors generally need to evaluate product specifications, packaging requirements, quality inspection procedures, and delivery arrangements.

For this MCB 4.5KA 1P DIN Rail Miniature Circuit Breaker, product configuration and supply details can be confirmed according to the intended electrical distribution application.

Customers can contact our team to discuss technical requirements, product models, packaging arrangements, and export shipping details.

Frequently Asked Questions (FAQ)

Q1: What is the difference between Type C and Type D tripping curves?

A1: Type C (5–10 In) is commonly used for general residential and commercial lighting circuits, sockets, and standard loads. Type D (10–20 In) is designed for circuits with higher inductive starting currents, such as small motors and transformers.

Q2: What is the rated breaking capacity of this breaker?

A2: The rated short-circuit breaking capacity is 4.5kA for the specified configuration. The product range also includes 6kA options for certain 1A–32A ratings according to IEC 60898. Please confirm the exact model and rating before selection.

Q3: Can we customize our own brand name or logo on the product?

A3: Yes. OEM laser printing for brand logos and model names, as well as customized carton packaging, can be discussed according to order quantities and customization requirements.

Q4: What is the Minimum Order Quantity (MOQ)?

A4: For standard packaging, the MOQ is 240 pcs (1 carton). For customized OEM branding, the typical MOQ starts at 2,000 poles. Please confirm the final quantity with our sales team.

Sample Policy & Warranty Terms

● Sample Support: Product samples are available for evaluation and testing. Contact our sales team for sample arrangements.

● Standard Warranty: 12-month standard factory warranty from the date of shipment against manufacturing defects under normal operating conditions.

● Defect Handling: Clear replacement terms for verified quality issues.

OEM Customization Process

We offer OEM manufacturing services for brand distributors and importers:

● Specification Confirmation: Confirm pole count (1P/2P/3P/4P), rated current, and tripping curve requirements.

● Branding & Artwork Approval: Confirmation of laser logo marking, rating labels, and packaging design.

● Sample Confirmation: Pre-production sample review if requested.

● Batch Production & Packaging: Manufacturing, testing, and standard export carton packing.

Procurement & Inquiry Guide

To request a quotation for the MCB 4.5KA 1P DIN Rail Miniature Circuit Breaker, please provide the following information with your inquiry:

● 1. Pole Requirements: 1P, 2P, 3P, or 4P.

● 2. Rated Current & Quantity Breakdown: For example, 16A, 32A, or 63A with required quantities.

● 3. Tripping Curve: Type B, Type C, or Type D.

● 4. Packaging & Branding: Standard packaging or OEM custom logo.

● 5. Destination Port & Delivery Terms: FOB, CIF, or EXW.