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Residual current release for power circuit breaker
Residual current releases for power circuit breakers, also known as earth leakage modules or RCD blocks, are essential protection devices designed to detect leakage currents to earth and trip the associated circuit breaker. These releases are typically available in 2P, 3P, or 4P configurations, with rated residual currents ranging from 30 mA to ...
Residual current releases for power circuit breakers, also known as earth leakage modules or RCD blocks, are essential protection devices designed to detect leakage currents to earth and trip the associated circuit breaker. These releases are typically available in 2P, 3P, or 4P configurations, with rated residual currents ranging from 30 mA to 30 A, and rated voltages up to 690 V AC. They integrate with molded case circuit breakers (MCCBs) or air circuit breakers (ACBs) via mechanical or electrical interlocking, ensuring selective coordination in distribution systems. The releases operate at frequencies of 50/60 Hz and offer adjustable time delays for selectivity, with some models featuring Type A, AC, or B sensitivity for different fault current waveforms.
These residual current releases are primarily deployed in low-voltage electrical distribution boards, industrial control panels, and automation systems where ground fault protection is critical. They are commonly found in sectors such as manufacturing plants, commercial buildings, data centers, and renewable energy installations like solar farms. In industrial environments, they protect motors, drives, and sensitive electronic equipment from earth faults, while in commercial settings, they ensure safety in lighting and socket circuits. They are also used in marine and offshore applications where moisture increases leakage risks.
Key subcategories include the ETIM EC001021 series, with article codes like RCR-2P-30mA-230V or RCR-4P-300mA-400V, where the code typically indicates poles, sensitivity, and voltage. Main articles cover fixed and adjustable types, with variants for AC and DC applications. The code structure often follows a pattern: RCR-[Poles]-[Sensitivity]-[Voltage]-[Type], such as RCR-3P-100mA-400V-A for Type A sensitivity. These releases are available with auxiliary contacts for remote signaling and undervoltage release coils for enhanced control.
Partnering with Electric Automation Network ensures access to genuine residual current releases with real-time pricing and global express shipping. Our engineering team provides tailored technical support for selecting the correct release for your circuit breaker, including coordination studies and documentation. We offer competitive bulk pricing and fast delivery to over 100 countries, minimizing downtime in your projects.
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