BENDER RCMA423-D-2 Residual Current Monitor

Description

BENDER RCMA423-D-2 Residual Current Monitor

Product Dimensions：

The Bender RCMA423-D-2 is an AC/DC sensitive residual current monitor (RCM) from the LINETRAXX® series. Designed for grounded AC, DC, and AC/DC power supply systems (TN/TT systems), it detects both alternating fault currents and smooth direct fault currents to provide early warning before a system shutdown occurs.

Product Detailed Description

The RCMA423-D-2 continuous monitoring device works alongside an external measuring current transformer (such as the CTUB or W… series). It evaluates frequency components up to 2,000 Hz, making it effective for modern industrial electrical setups involving power electronics like variable frequency drives (VFDs) and inverters.

Equipped with a digital liquid crystal display (LCD) and multi-functional push buttons, it provides real-time readout of measured residual currents and allows parameterization directly on the device. The suffix “-D-2” specifies its wide-range auxiliary supply voltage configuration (70–300 V AC/DC).

Technical Parameters

Product Advantages

• AC/DC Sensitivity (Type B RCM): Detects AC, pulsating DC, and smooth DC residual currents, preventing blind spots caused by DC ground faults blinding standard Type A relays.
• Wide Supply Voltage Range: The “-D-2” variant accepts a high auxiliary input voltage range (70–300 V AC/DC), eliminating the need for dedicated step-down transformers in high-voltage panels.
• Two Independent Alarm Thresholds: Features pre-alarm (Alarm 1) and main alarm (Alarm 2) settings, allowing operators to act before a critical trip shuts down production.
• Frequency Compatibility: Handles higher-frequency noise (up to 2 kHz) produced by modern pulse-width modulated (PWM) inverter outputs without false tripping.
• History Memory: Includes an integrated history memory log to review past fault values and timestamped events for easier troubleshooting.

Important Considerations & Precautions

• Requires External Measuring Transformer: The RCMA423-D-2 is an evaluation unit and must be paired with an appropriate measuring current transformer (e.g., Bender W… or CTUB series) to route the system conductors through.
• Proper Cable Routing: All phase conductors and the neutral conductor (L1, L2, L3, N) must pass through the transformer core together. The Protective Earth (PE) conductor must never pass through the core.
• Not an RCD (Residual Current Device): This unit is a residual current monitor designed to signal or trigger external switchgear; it does not contain integrated primary power contact breakers to clear high-power faults on its own.
• Terminal Wiring Integrity: Double-check connections for the auxiliary power (A1/A2) and external CT inputs (k/l) before energizing to prevent internal sensor damage.

Product Applications

• Drive Systems & Inverters: Monitoring motor feeder circuits driven by Variable Frequency Drives (VFDs) or soft starters.
• Photovoltaic & Energy Storage: Ground-fault monitoring on the AC/DC output stages of solar inverter systems and battery energy storage systems (BESS).
• Industrial Automation: Continuous residual current tracking in sensitive automated assembly lines, CNC machining facilities, and semiconductor fabrication.
• Datacenters & Uninterruptible Power Supplies (UPS): Early detection of insulation deterioration in critical IT power distribution units (PDUs) and UPS output paths.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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