Overview

Operating conditions

3RV2 motor starter protectors/circuit breakers are suitable for use in any climate. They are intended for use in enclosed rooms in which no severe operating conditions (such as dust, caustic vapors, hazardous gases) prevail. When installed in dusty and damp areas, suitable enclosures must be provided.

3RV2 motor starter protectors/circuit breakers can optionally be fed from the top or from below.

The permissible ambient temperatures, the maximum switching capacities, the tripping currents and other boundary conditions can be found in the technical specifications and tripping characteristics.

3RV2 motor starter protectors are suitable for operation in IT systems (IT networks). In this case, the different short-circuit breaking capacity in the IT system must be taken into account.

Since operational currents, starting currents and current peaks are different even for motors with identical power ratings due to the inrush current, the motor ratings in the selection tables are only guide values. The specific rated and start-up data of the motor to be protected is always paramount to the choice of the most suitable motor starter protector. This also applies to motor starter protectors for transformer protection.

Possible uses

The 3RV motor starter protectors/circuit breakers can be used:

• For short-circuit protection
• For motor protection (also with overload relay function)
• For system protection
• For short-circuit protection for starter combinations
• For transformer protection
• As main and EMERGENCY-STOP switches
• For operation in IT systems (IT networks)
• For switching of DC currents
• In areas subject to explosion hazard (ATEX)
• As circuit breaker according to UL 489 (3RV27 and 3RV28)
• For fuse monitoring
• For distance protection

Special versions of 3RV2 motor starter protectors/circuit breakers can be used for low ambient temperatures down to -50 °C or also for system protection. More detailed information is available on request.

Use of SIRIUS protection devices in conjunction with IE3/IE4 motors

Note:

For the use of 3RV2 motor starter protectors/circuit breakers in conjunction with highly energy-efficient IE3/IE4 motors, please observe the information on dimensioning and configuring, see "Application Manual for SIRIUS Controls with IE3/IE4 motors", https://support.industry.siemens.com/cs/ww/en/view/94770820.