SIEMENS 3RR2241-2FW30 Current Monitoring Relay

Overview

SIEMENS 3RR2241-2FW30 is a digital three-phase current monitoring relay from the SIRIUS 3RR2 series. SIEMENS 3RR2241-2FW30 is designed for direct attachment to S00 size 3RT2 contactor, providing apparent and active current measurement, overcurrent and undercurrent alarm, phase supervision and motor blocking detection. This SIEMENS 3RR2241-2FW30 is widely stocked as spare motor monitoring unit for SIRIUS motor control assemblies.

Features

SIEMENS 3RR2241-2FW30 supports digitally adjustable setting via front panel keys and LCD display, measuring range 1.6 A to 16 A, frequency range 20 Hz to 400 Hz. It offers independent threshold configuration for warning and alarm, with adjustable on delay, noise suppression delay and post-fault pause time. 3RR2241-2FW30 integrates comprehensive diagnostic functions including phase failure, cable break, phase sequence, residual current and motor locked rotor detection. It provides one changeover relay contact and one semiconductor output for separate warning and alarm signals to PLC or host control system. This unit adopts spring-type push-in terminals for fast wiring and replacement. It accepts wide auxiliary supply 24 V to 240 V AC DC. It is CE compliant and follows IEC 60947-5-1 standard, designed for 24/7 continuous operation in pump, fan, compressor and conveyor motor control panels.

Specifications

SIEMENS 3RR2241-2FW30 SIRIUS 3RR2 Current Monitoring Relay Brand: SIEMENS Series: SIRIUS 3RR2 Model: 3RR2241-2FW30 Type: digital three-phase current monitoring relay Matching contactor: 3RT2 S00 frame Measuring range: 1.6 A ~ 16 A Frequency range: 20 Hz ~ 400 Hz Supply voltage: 24 ~ 240 V AC DC Output: 1 change-over relay contact, 1 semiconductor output Adjustable timers: on delay 0 ~ 99 s, noise suppression 0 ~ 30 s, pause after fault 0 ~ 300 min Diagnostic items: overcurrent, undercurrent, phase failure, cable break, phase sequence, residual current, blocking current Connection: spring push-in terminal Display: LCD graphic display Mounting: direct mount on 3RT2 S00 contactor Protection class: IP20 front face Ambient temperature: -20 ℃ ~ +60 ℃ Status: active SIRIUS monitoring relay spare

Principle

SIEMENS 3RR2241-2FW30 samples three-phase current signals from the contactor built-in sensing structure. This Current Monitoring Relay calculates apparent and active current value, compares the measured value with preset warning and alarm thresholds. It monitors phase continuity and sequence status continuously. When abnormal condition is detected, the relay contact and semiconductor output switch state to trigger alarm or equipment interlock, and fault information is stored in internal buffer.

Applications

SIEMENS 3RR2241-2FW30 is deployed in water treatment pumps, HVAC fans, compressors, conveyor drives and packaging machine motor feeders. It monitors running current and protects motor from dry run, locked rotor and phase loss. SIEMENS 3RR2241-2FW30 is stocked as spare current monitoring relay for SIRIUS 3RT2 motor control assemblies.