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10KA Miniature Circuit Breaker TDM5-125

Talemod TDM5-125 miniature circuit breaker is used for over-current protection and short circuit protection of all power line facilities and electrical equipment in buildings, and completing infrequent switching operation for the lines in normal circumstance. The product is applied to the lines with AC 50/60Hz, rated voltage of 240/415V, and rated working current up to 125A. The rated short-circuit breaking capacity has 10KA. The circuit breaker adopts modular design and complies with the standard IEC60947-2, has reliable performance, accurate protection characteristics, small size, and is suitable for industrial and commercial lighting distribution lines.

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Product Details

Technical Data

Standard	IEC60947-2
Rated current (In)	63-125A
Poles	1P 2P 3P 4P
Rated voltage (Ue)	240-125A
lnsulation voltage (Ui)	500V
Rated frequency	50/60Hz
Rated breaking capacity (lcn)	10KA
Rated operating short circuit breaking capacity (lcs)	7.5KA
Energy limiting class	3
Tripping curve	B C D
Electrical and Mechanical life	20000

Installation

Protection degree	IP20
Reference temperature for setting of thermal element	30℃
Ambient temperature	-25~+40℃
Storage temperature	-25~+70℃
Terminalconnection type	Cable/Pin -type busbar
Terminal size top/bottom for cable	50m㎡
Tightening torque	2.5N.m
Connection	Top and bottom

Combination with accessories

SHUNT RELEASE	Yes
AUXILIARY CONTACT	Yes
ALARM CONTACT	Yes
UNDER VOLTAGE RELEASE	Yes
OVER VOLTAGE RELEASE	Yes

Product Overview

A 125A miniature circuit breaker (MCB) is a critical protection device used in electrical distribution systems, specifically designed for high-current circuits. It integrates dual functions of overload protection and short-circuit protection. When the current in the circuit exceeds the rated value (e.g., due to overload) or experiences a severe short-circuit fault, it can quickly and reliably automatically cut off the power supply, effectively preventing conductor overheating, equipment damage, and electrical fire hazards.

Core Functions

Precise Overload Protection:Utilizing a thermal tripping mechanism with a bi-metallic strip, the MCB responds to persistent overcurrents that exceed its rated value (e.g., 125A). This protection is time-delayed, allowing for harmless, temporary current surges (like motor start-ups) without nuisance tripping, while disconnecting the circuit in the event of a sustained overload that could cause insulation damage and conductor overheating.

Rapid Short-Circuit Protection:Equipped with an electromagnetic tripping mechanism, the MCB instantaneously detects and reacts to very high fault currents typical of short circuits. This rapid trip action (within milliseconds) minimizes the destructive energy let-through, thereby protecting downstream cables, connected equipment, and the overall installation from severe thermal and mechanical stress.

Reliable Switching and Isolation:The device serves as a manual ON/OFF switch for routine control of the circuit. Furthermore, in the tripped or manually switched OFF position, it provides a visible and reliable isolation gap, ensuring the circuit is de-energized for safe maintenance and inspection.

Enhanced Electrical Fire Prevention:By reliably interrupting both overload and short-circuit faults—two primary causes of excessive heat buildup—the MCB acts as a crucial first line of defense against the risk of electrical fires originating from the wiring installation.

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