PRODUCT DESCRIPTION
SIEMENS 3RB3123-4QB0 - Electronic Overload Relay
This device is an electronic overload relay from the SIEMENS SIRIUS 3RB3 series, engineered for precise thermal protection of three-phase AC motors. It provides adjustable overload release classes and a wide current setting range, ensuring reliable motor protection against excessive current draw, phase failure, and phase unbalance. The unit integrates seamlessly with SIEMENS SIRIUS 3RT2 contactors of size S0 or can be utilized for stand-alone installation in industrial control panels.
Technical Specifications:
- SERIES/FAMILY: SIRIUS 3RB3
- COMPONENT TYPE: Electronic Overload Relay
- ELECTRICAL SPECS:
- MAIN CIRCUIT CURRENT RANGE: 10-40 A
- AUXILIARY CIRCUIT VOLTAGE: 24-240V AC/DC
- AUXILIARY CONTACTS: 1 Normally Open (NO) + 1 Normally Closed (NC)
- OVERLOAD RELEASE CLASS: Adjustable CLASS 5E, 10E, 20E, 30E
- PHASE: Three-phase
- MECHANICAL/PHYSICAL:
- FRAME SIZE: S0 (compatible with 3RT2 contactors S0)
- TERMINAL TYPE: Screw terminals for main and auxiliary circuits
- RESET FUNCTION: Manual/Automatic selectable
- INTERFACE/CONTROL:
- FEEDBACK: Auxiliary contacts for status indication and control circuit integration
- ENVIRONMENTAL/MOUNTING:
- IP RATING: IP20 (terminal area)
- MOUNTING STYLE: Direct mounting to 3RT2 contactor (S0) or stand-alone installation on DIN rail
- COOLING METHOD: Natural convection
- COMPATIBILITY/APPLICATION:
- TARGET SYSTEMS: Industrial motor control circuits, pump applications, fan drives, conveyor systems
- COMPATIBLE CONTACTORS: SIEMENS SIRIUS 3RT2 contactors, size S0