3RB1257-0KM00 overload relay Siemens

Description

Overview

Essential details：3RB1257-0KM00 overload relay Siemens

Relay is an automatic switch element with isolation function, which is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment, and is one of the most important control components.
Relays generally have an induction mechanism (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); There is an actuator (output part) that can realize “on” and “off” control of the controlled circuit; Between the input part and the output part of the relay, there is an intermediate mechanism (drive part) for coupling and isolating the input, functional processing and driving the output part.
As a control element, in summary, the relay has the following functions:
(1) Expand the control range: For example, when the control signal of the multi-contact relay reaches a certain value, it can be changed, broken, and connected to the multi-circuit at the same time according to different forms of the contact group.
(2) Amplification: For example, sensitive relays, intermediate relays, etc., can control a large power circuit with a very small control amount.
(3) Integrated signal: For example, when multiple control signals are input into multi-winding relays in the specified form, the predetermined control effect is achieved through comparative integration.
(4) Automatic, remote control, monitoring: for example, the relay on the automatic device, together with other electrical appliances, can form a program control line, so as to achieve automatic operation.

3RB1257-0KM00

① Rated working voltage: refers to the voltage required by the coil when the relay is working normally. Depending on the type of relay, it can be AC voltage or DC voltage.
② DC resistance: refers to the DC resistance of the coil in the relay, which can be measured by a multimeter.
③ Suction current: refers to the minimum current that the relay can produce suction action. In normal use, the given current must be slightly greater than the draw current for the relay to work stably. For the working voltage added to the coil, generally do not exceed 1.5 times the rated working voltage, otherwise it will produce a large current and burn the coil.
④ Release current: refers to the maximum current generated by the relay release action. When the current in the draw state of the relay is reduced to a certain degree, the relay will return to the unpowered release state, and the current is far less than the draw current.
⑤ Contact switching voltage and current: refers to the voltage and current that the relay allows to load. It determines the size of the voltage and current that the relay can control, and cannot exceed this value when used, otherwise it is easy to damage the contact of the relay.

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