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Home > Electrical & Electronics > Electrical Control System > ABB 81AB03-E GJR2392500R121 Molded Case Circuit Breaker of Tmax T4 Series

ABB 81AB03-E GJR2392500R121 Molded Case Circuit Breaker of Tmax T4 Series

Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

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Material:

Other, Global universal model

Condition:

Other, Global universal model

Task:

Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

1Yr

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guizhou

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Material Other, Global universal model

Condition Other, Global universal model

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

Operating Temperature -20℃ to 60℃

Relative Humidity 5%-95% (non-condensing)

Dimensions 140×85×105mm

I. Product Overview

ABB 81AB03-E GJR2392500R121 is a core power distribution protection device in ABB's Tmax T4 series of molded case circuit breakers. Specifically designed for the protection of branch circuits in medium and low-voltage power distribution systems, it is widely used in scenarios such as industrial production line power distribution, commercial building lighting and power circuits, data center auxiliary power distribution, and civil residential power distribution trunks. Its core function is to accurately monitor and quickly interrupt abnormal conditions in circuits, such as overloads, short circuits, and earth faults. At the same time, it has selective protection capability, which can effectively isolate faulty circuits, prevent the spread of faults, and ensure the safe and stable operation of the entire power distribution system and reliable power supply for electrical equipment.

This circuit breaker integrates ABB's mature low-voltage protection technology and modular design concept. It adopts a high-strength flame-retardant plastic enclosure, silver-tungsten alloy contacts, and an efficient arc-extinguishing system, featuring outstanding characteristics such as excellent breaking capacity, high protection accuracy, easy operation, flexible installation, and long service life. The product has passed the certification of IEC 60947-2 International Standard for Low-Voltage Switchgear, GB 10963.1 Chinese Standard for Circuit Breakers for Overcurrent Protection in Household and Similar Installations, and UL 489 American Standard for Industrial Circuit Breaker Safety. It can operate stably in complex scenarios with a wide temperature range of -20℃~60℃, relative humidity ≤95% (no condensation), and high dust levels. It is compatible with mainstream power distribution voltage levels of AC 230V/400V, meeting the requirements for high reliability, safety, and easy maintainability of power distribution protection in different scenarios.

II. Functional Features

Triple Precise Protection, Covering All-Scenario Faults: The circuit breaker integrates three protection functions: overload protection, short-circuit protection (short-time delay + instantaneous), and earth fault protection, and adopts differentiated protection mechanisms for different fault types. Overload protection is based on the principle of thermal deformation of bimetallic strips and exhibits inverse-time characteristics—the greater the current overload, the shorter the action time. For example, the action time is approximately 180s at 1.2In and about 4s at 6In, which can accurately match the overload tolerance characteristics of loads such as cables and motors. Short-circuit protection uses the electromagnetic tripping principle: the short-time delay mode supports selective coordination between upper and lower-level circuit breakers to avoid cascading tripping, while the instantaneous mode can interrupt a 36kA short-circuit current within ≤0.02s, minimizing the impact of faults. Earth fault protection detects unbalanced current in the circuit through a zero-sequence current transformer and acts quickly when the earth fault current exceeds the set threshold, effectively preventing the risk of personal electric shock and equipment insulation damage. Each protection parameter can be precisely adjusted via the side knobs to adapt to different load scenarios.
Efficient Arc-Extinguishing System, Safe and Reliable Interruption: It adopts ABB's patented labyrinth-type arc-extinguishing chamber design, with multiple sets of copper-plated arc chutes and gas-generating insulating materials built-in. When a short circuit occurs in the circuit and an arc is generated, the arc is quickly drawn into the arc-extinguishing chamber under the action of magnetic force and split into multiple short arcs by the chutes. At the same time, the gas-generating material releases insulating gas when heated, accelerating the cooling and extinguishing of the arc. This ensures reliable interruption under a 36kA short-circuit current and stable insulation performance after interruption. The contacts are made of silver-tungsten alloy, which has excellent electrical conductivity and anti-welding capability, and can maintain good contact even after multiple switching operations and short-circuit interruptions, effectively extending the electrical service life of the product. The enclosure is made of reinforced PA66 flame-retardant plastic with an oxygen index ≥30%, complying with the UL 94 V-0 flame-retardant rating. It can effectively isolate arcs and high temperatures, preventing the spread of fires.
Intuitive Status Monitoring, Convenient Fault Localization: The front of the circuit breaker is equipped with multi-color LED status indicators, which clearly display operating states such as "Normal Closed", "Overload Fault", "Short-Circuit Fault", and "Earth Fault". On-site operation and maintenance personnel can quickly judge the operating condition of the equipment through the indicators. It is also equipped with optional auxiliary contacts, which can upload the switching status and fault signals to the power distribution monitoring system to realize remote status monitoring. The circuit breaker has a built-in fault memory function—even if the power is cut off and then turned on again, it can still retain the information of the most recent fault type, providing an accurate basis for fault troubleshooting and significantly shortening maintenance time.
Flexible Installation and Operation, Low Maintenance Cost: It adopts a compact structural design with an overall dimension of only 140×85×105mm, saving installation space in the distribution box. It supports two installation methods: 35mm standard guide rail quick installation and bolt-fixed installation, adapting to the layout requirements of different distribution boxes. The terminal blocks adopt a crimping design, supporting the connection of 10~35mm² copper/aluminum wires. The wiring is firm and has low contact resistance, which can effectively reduce the problem of heat generation at the wiring points. The operation uses a user-friendly rotating handle design, with clear switching positioning and an operating torque of ≤5N·m, making it convenient and labor-saving. The product adopts a modular design—core components such as the protection unit and contacts can be independently disassembled and replaced, eliminating the need for overall removal during maintenance, thus reducing maintenance costs and downtime.
Wide System Adaptability, Excellent Compatibility: As a core product of the Tmax T4 series, this circuit breaker can be seamlessly matched with ABB series devices such as contactors, thermal relays, and surge protectors to form a complete motor control and power distribution protection circuit. It supports selective protection coordination with upper-level ABB SACE Tmax T5/T6 series molded case circuit breakers or Emax air circuit breakers. By reasonably setting the protection parameters of upper and lower levels, it ensures that only the circuit breaker of the faulty circuit acts in case of a fault, while other circuits maintain normal power supply, improving the power supply reliability of the power distribution system. It is compatible with AC 230V/400V voltage levels and can be used in three-phase three-wire, three-phase four-wire, and single-phase power distribution systems, widely applicable to various scenarios such as industrial, commercial, and civil fields.
High-Reliability Design, Long and Durable Service Life: Core components are made of industrial-grade high-quality materials. The bimetallic strips are made of imported nickel-chromium alloy, with excellent thermal stability—the protection accuracy deviation is ≤5% within the temperature range of -20℃~60℃. The operating mechanism adopts a spring energy storage design, ensuring smooth switching actions and low mechanical wear, with a mechanical service life of more than 8,000 times. The contact surface is treated with a special coating, which has strong oxidation resistance and wear resistance, with an electrical service life of more than 800 times. The product has undergone strict environmental reliability tests, including high-temperature aging, low-temperature impact, damp-heat cycle, and vibration impact tests. Its Mean Time Between Failures (MTBF) is ≥180,000 hours, enabling it to adapt to complex and harsh operating environments.

III. Technical Parameters

Parameter Category	Parameter Name	Specific Parameters	Unit
Basic Parameters	Model Number	ABB 81AB03-E GJR2392500R121	-
	Product Type	Molded Case Circuit Breaker of Tmax T4 Series	-
	Pole Number	3 poles (fixed)	Pole
	Overall Dimensions (L×W×H)	140×85×105	mm
	Weight	Approximately 1.6kg	kg
	Installation Method	35mm standard guide rail installation, bolt-fixed installation	-
Electrical Parameters	Rated Operating Voltage (Ue)	AC 400V (three-phase), AC 230V (single-phase)	V
	Rated Current (In)	32A	A
	Rated Breaking Capacity (Icu)	36kA at AC 400V	kA
	Rated Short-Time Withstand Current (Icw)	36kA at AC 400V (0.5s)	kA
Protection Parameters	Overload Protection (Long-Time Delay) Setting Range	0.5~1.0In (adjustable)	-
	Short-Circuit Protection (Short-Time Delay) Setting Range	4~10In (adjustable), delay 0.1~0.3s (adjustable)	-/s
	Instantaneous Short-Circuit Protection Setting Range	8~16In (adjustable)	-
	Earth Fault Protection Setting Range	0.1~0.4In (adjustable), delay 0.1~0.5s (adjustable)	-/s
	Protection Accuracy	±5% (overload protection); ±10% (short-circuit and earth fault protection)	-
Mechanical & Environmental Parameters	Operation Method	Manual operation (rotating handle)	-
	Mechanical Life	≥8,000 switching operations	Time
	Electrical Life	≥800 switching operations at rated current	Time
	Operating Temperature Range	-20~60℃	℃

IV. Working Principle

The working principle of the ABB 81AB03-E GJR2392500R121 molded case circuit breaker takes "signal collection - fault judgment - mechanism tripping - arc extinguishing - status feedback" as the core link. Combining mechanical structure and electromagnetic control technology, it realizes the full-process protection of power distribution circuits. The specific process is as follows:

Circuit Connection and Normal Operation: The circuit breaker is connected to the power distribution trunk through input terminals, and the output terminals are connected to the branch load circuit. After installation, the operating handle is rotated to the "Closed" position. The operating mechanism drives the moving contacts and fixed contacts to close, the circuit is connected, and the load receives stable power supply. During normal operation, the built-in current sensor collects the circuit current in real time, the temperature sensor monitors the contact temperature, and the data is synchronously transmitted to the protection unit. At this time, the bimetallic strip is in a natural state, the current in the electromagnetic trip coil is small, and the generated electromagnetic force is insufficient to drive the tripping mechanism. The circuit breaker remains in the closed state, and the "Normal Closed" LED indicator is on.
Overload Protection Action Process: When the load current exceeds the overload protection setting threshold, the current flowing through the bimetallic strip increases, and the bimetallic strip gradually bends due to heat caused by the difference in thermal expansion coefficients of the two metals. The degree of bending increases with the magnitude of the overload current and the duration of the overload. When the bending amount reaches the mechanical threshold, it pushes the tripping mechanism to unlock, and the operating mechanism drives the moving contacts to separate quickly under the action of the spring force, cutting off the circuit. At the same time, the "Overload Fault" LED indicator lights up, and the auxiliary contact sends a fault signal to the monitoring system. After the overload fault is eliminated, the bimetallic strip cools naturally to room temperature and returns to its original state. Power supply can be restored by rotating the handle to the "Closed" position.
Short-Circuit Protection Action Process: When a short circuit occurs in the circuit (the current exceeds the short-time delay or instantaneous setting threshold), there are two action modes: ① Short-time delay action: The short-circuit current flows through the electromagnetic trip coil, generating a strong electromagnetic force to attract the armature. However, the tripping mechanism acts with a delay of 0.1~0.3s under the action of the delay component, ensuring that the lower-level branch circuit breaker interrupts first to achieve selective protection. ② Instantaneous action: When the short-circuit current far exceeds the instantaneous setting threshold, the electromagnetic force directly overcomes the resistance of the delay component and drives the tripping mechanism to act instantly, with an interruption time of ≤0.02s. The arc generated at the moment of short-circuit interruption is guided into the labyrinth-type arc-extinguishing chamber by magnetic force, split and cooled by the chutes, and extinguished by the insulating gas generated by the gas-generating material, preventing the arc from leaking. After the action, the "Short-Circuit Fault" LED indicator lights up, and the fault information is recorded.
Earth Fault Protection Action Process: When an earth fault occurs in the circuit (such as phase wire grounding or insulation damage), the three-phase current is unbalanced, generating a zero-sequence current. After the zero-sequence current transformer detects this current, it converts the signal into an electrical signal and transmits it to the earth fault protection unit. The protection unit compares the detected value with the set threshold. When the threshold is exceeded, it triggers the tripping mechanism to act and cut off the circuit. The action delay can be adjusted within 0.1~0.5s, which not only avoids false actions caused by instantaneous interference but also quickly cuts off the faulty circuit. The "Earth Fault" LED indicator lights up synchronously, and the fault information is stored in memory.
Switching Operation Mechanism: During manual closing, rotate the handle to the "Closed" position. The energy storage spring in the operating mechanism is compressed to store energy. After the moving contacts and fixed contacts are closed, the mechanism automatically locks to ensure a stable closed state. During manual opening, rotate the handle to the "Open" position. The locking mechanism unlocks, and the energy storage spring releases energy to drive the moving contacts to separate. During the switching process, the auxiliary contacts switch states synchronously, feeding back the operation result to the external monitoring system in real time to form an operation closed loop.