Siemens SIRIUS 3RU - Electrical Remote RESET Module (3 RU21)

Accessories
10.4 Module for electrical remote RESET (3RU21 only)
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
134 Manual, 09/2016, A5E03656507420A/RS-AB/003
10.4
Module for electrical remote RESET (3RU21 only)
10.4.1
Description
Function
An electrical remote RESET module which is compatible for use with all sizes is available for
the 3RU21 thermal overload relay. This module enables the overload relay to be reset
electrically from the control room following tripping. The module's coil is dimensioned for an
operating duration of 0.2 s to 4 s; maintained-contact operation is not permissible.
10.4.2
Connecting remote reset
Connection
The screw connections on the terminals of the electrical remote RESET module have the
same format as the screw connections on the auxiliary contacts of the 3RU21 overload relay.
Table 10- 1 Connection data for the remote RESET
Operating range
The operating range of the coil is 0.85 to 1.1 x U
s
Power input
The power input of the electrical remote RESET module is: 80 V AC,
70 W DC
Switching frequency
60/h
Voltages
The electrical remote RESET module is available for the following voltages:
• 24 to 30 V AC/VDC
• 110 to 127 V AC/VDC
• 220 to 250 V AC/VDC