ABB Electrical S271K25 S271-K25 Breaker

ABB Electrical S271K25 S271-K25 Breaker

Basic Parameters

Rated voltage: 277V AC, suitable for AC circuits of this voltage level, can provide corresponding protection for electrical equipment and lines.

Rated current: 25A, in this current and below, the circuit breaker can work normally, when the current exceeds 25A, the circuit breaker will cut off the circuit according to the overload or short-circuit situation.

Number of poles: 1 pole, mainly used for controlling and protecting single-phase AC circuits, widely used in single-phase electrical equipments and circuits in households, commerce and some industries.

Functional characteristics

Protection Function:

Overload protection: realised by the internal thermal release element. When the current in the circuit exceeds the rated current of 25A for a long time, the bimetal in the thermal release element will be bent and deformed due to heat, which will push the release mechanism to act, thus cutting off the circuit and effectively preventing the lines and equipment from being damaged due to overload.

Short-circuit protection: Once a short-circuit fault occurs in the circuit, the instantaneous generation of a huge short-circuit current will cause the electromagnetic release device to act quickly, generating a strong electromagnetic force to attract the armature, drive the release mechanism to quickly cut off the circuit, limiting the impact of the fault to a minimum range, to protect the equipment and personnel safety.

Withholding characteristic: adopting K-type withholding characteristic curve, which is the unique withholding characteristic of ABB, after a long period of practical verification, the response to fault current is more sensitive and accurate, which can be better adapted to the protection needs of the motor system or transformer system and other loads, and effectively avoid damages to the equipment caused by overloads or short circuits.

Installation: DIN rail mounting, this way is simple and convenient, can be easily installed on the standard DIN rail, in the distribution cabinet and other electrical equipment for flexible layout, saving installation space and time, improve installation efficiency.

Application Areas

Industrial field: It can be used for the distribution protection of various small electrical equipment in factories, such as small motors, control circuits, lighting systems and other branch circuit protection, to ensure the stable operation of electrical equipment in the production process, to prevent the interruption of production due to circuit failure.

Commercial places: It is suitable for the protection of lighting circuits and socket circuits in shopping malls, office buildings, hotels, etc., to ensure the reliability and safety of power supply, provide stable power support for commercial operations, and avoid the normal development of commercial activities due to electrical failures.

Residential: In the family electricity, it can protect all kinds of electrical equipment and lighting circuits, prevent overload or short circuit from causing electrical fires and other safety accidents, ensure the safety of residents' electricity consumption, and provide reliable protection for the family electricity consumption.

Main features

· 24 digital inputs with LED displays 

· 16 digital transistor outputs with LED displays 

· 8 digital inputs/outputs with LED displays 

· 8 individually configurable analog inputs 0...10 V, 0...5 V, ±10 V, ±5 V, 0...20 mA, 4...20 mA, differential inputs, Pt100 (2-wire or 3-wire), the analog inputs are also individually configurable as digital inputs 

· 4 individually configurable analog outputs ±10 V, 0...20 mA, 4...20 mA 

· 2 counters for counting frequencies up to 50 kHz, configurable in 7 different operating modes · 1 CS31 system bus interface for system expansion 

· 1 interface for connecting communication modules (e.g. 07 KP 90) 

· 2 serial interfaces COM1, COM2 

– as MODBUS interfaces and 

– for programming and test functions 

· Real-time clock 

· LEDs for displaying operating conditions and error messages 

· Detachable screw-type terminal blocks 

· Fastening by screws or by snapping the device onto a DIN rail 

· The lithium battery 07 LE 90 can be put into the battery compartment in order to 

– store and backup the user program in the RAM 

– store and backup data which is additionally contained in the RAM, e.g. the status of flags 

– backup the time and date (real-time clock) 

· RUN/STOP switch for starting and aborting the program execution