Standards

IEC 60947-1, DIN EN 60947-1,
IEC 60947-4-1, DIN EN 60947-4-1,
IEC 60947-5-1, DIN EN 60947-5-1,
IEC 60831-1, DIN EN 60831-1,
IEC 61921, DIN EN 61921

The contactors are suitable for use in any climate. They are safe to touch according to EN 50274.

Function

The 3RT26 capacitor contactors are special versions of the 3RT20 contactors in sizes S00, S0 and S2 that are designed for switching capacitor banks.

They are designed to convey the inrush current in such applications, and are weld-resistant in compliance with the technical specifications.

3RT26 contactors are suitable for capacitors with and without reactor protection. Besides switching power capacitors in reactive-current compensation systems, they are also used to switch converters.

In the case of 3RT26 capacitor contactors, the pre-charging resistors are an integral component of the contactor. The pre-charging resistors are activated via leading auxiliary contacts before the main contacts close. During switching, they are decoupled again after attenuation of the peak current. Attenuation of the inrush current peaks also reduces interfering harmonics in the supply.

Notes:

Only discharged capacitors are permitted to be switched on with capacitor contactors.

Manual operation for function tests is impermissible. The pre-charging resistors must not be removed.

Auxiliary switches

The variance of the freely available auxiliary switches has been increased; see the ordering data for available versions. Versions differing from this can be requested.

In sizes S00 and S0, the auxiliary switch block snapped onto the capacitor contactor contains the three leading NO contactors as well as one freely available auxiliary contact. In addition, one (S00) or two (S0) other freely available auxiliary contacts are available in the basic device.

The fitting of auxiliary switches for capacitor contactors in sizes S00 and S0 of the respective version is not expandable. For size S2, freely available auxiliary switches are implemented by means of lateral auxiliary switch blocks. Further auxiliary switch blocks can be mounted laterally in accordance with the 3RT20 contactors.

Devices with 2 NC are now consistently available in all power quantities.