Introduction

mcb electrical Consumer Unit which is suitable for all kinds of residential house, villas, residential areas, etc, which is divided into surface and flush mounting installation and accord with EC 60439-3 international standard. The box body and panel are made of flame retardant ABS material. The small circular arc door can open up to 90 degrees. With galvanized din rail and adjustable support, the depth of din rail can be adjusted to install different size MCB and RCD.

Its panel layout is reasonable, and it can integrate start, stop, emergency stop, speed control and other shortcut buttons and touch screen display interface, which is convenient for timely monitoring and operation. The conforms to the standard of electrical wiring, reasonable layout in the cabinet and convenient installation of components. Its core components use well-known brands to ensure the source of genuine goods.

NUM：TSM-2/4/6/8/12

CLASS：Consumer Units

Outline And Installation Dimensions

Installation Instructions

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Common materials of low-voltage circuit breaker

It mainly includes the following materials:

1. Thermal bimetallic materials

2. Resistance alloy materials

3. Contact material

4. Insulating pressure plastic

5. Magnetic material

6. Elastic material

1. Thermal bimetallic materials

mcb electrical Consumer Unit Thermal bimetal is a composite material composed of two layers of metal (or alloy) components with different expansion coefficients firmly combined with each other. The layer with higher coefficient of thermal expansion is called the active layer, and the layer with lower coefficient of thermal expansion is called the passive layer. Sometimes the third layer (middle layer) can be compounded to obtain special performance. When the bending of thermal bimetals is limited by the resultant torque composed of the tension generated by the active layer and the tension generated by the passive layer, the thrust will be generated and the thermal energy will be converted into mechanical energy.

Thermal bimetallic materials can be divided into high sensitivity type, general type, low temperature type, high temperature type, special type and resistance series.

The main properties of thermal bimetallic materials include resistivity, specific bending, elastic modulus E, linear temperature range, allowable temperature range and density. (Specific bending: half of the curvature change of the longitudinal centerline of a flat hot bimetallic sample with unit thickness per unit temperature change.)

At present, the most commonly used bimetallic materials are: 5J4140, 5J20110 (5J11), 5J1480 (5J18), 5J1578 (5J16), R5, R10, R15 (R12), R25, R30, R50, etc.

Among them, 5J4140, 5J20110 (5J11), 5J1480 (5J18), 5J1455 (R50), 5J1430 (R33), etc. are used for direct heating circuit breakers with small current specifications (directly powered by bimetallic elements). 5J represents bimetal, 20 in 5J20110 is the specific bending K value, and 110 is the resistivity at 20 ℃（ μ Ω·cm)。

For some medium current circuit breakers, such as 40, 50, 63A circuit breakers, R15 (R12), R25, R30, R50, etc. are widely used in their side heating or direct heating types. They use 3Ni24Cr2 (nickel road steel) as the active layer, Ni36 as the passive layer, and intermediate layers such as copper staggered Cu Zr (mostly used for R15 and R12) and nickel layers (used for R30 and R50). The resistivity can be adjusted by changing the thickness of the interlayer.

The smaller the value after R is, the larger the applicable current level is; on the contrary, the smaller the applicable current level is. It also indicates the resistivity of the material at 20 ℃（μΩ·cm)。

Molded case circuit breakers with large current levels no longer use side heating or direct heating bimetal elements as overload delay protection. The main reason is that such a large amount of heat will make the temperature rise of the circuit breaker greatly exceed the standard requirements, and it is difficult to find metal materials with small resistivity that can meet various properties. Other methods are used, such as current transformer type.

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