Bender RCMA420-DM1C-1 Ground-Fault Monitor Relay

The Bender LINETRAXX RCMA420-DM1C-1 is a DC/AC ground-fault monitor designed for grounded and high-resistance-grounded systems, delivering reliable leakage-current detection and signaling via two Form-C (SPDT) relay outputs configured for pre-warning or main alarm. Ground-fault pickup levels are adjustable from 10 mA to 500 mA for AC/DC systems, with three independent delays—pickup delay, startup delay, and delay on reset—to tailor response to transient faults. The unit supports a DC/AC measurement range of 0–2000 Hz, enabling stable monitoring in systems with wide-frequency content such as drives, and is capable of providing protection in single- or three-phase AC networks up to 600 V and 100 A. Enclosures include NEMA 4X polycarbonate, NEMA 4X stainless steel, or non-enclosed variants, and a 6 mA fixed-trip UL 943 inverse variant is available for certain configurations.