RCMS460-D Bender Residual Current Monitor

The RCMS460 series Bender Residual Current Monitor provides ground-fault monitoring for up to twelve separate systems or channels in grounded and high-resistance grounded, AC/DC, single-phase or three-phase systems. The RCMS460 is also compatible with systems that contain power conversion equipment, such as variable frequency drives.

Each channel has an independently adjustable trip value. For AC systems, the trip value is adjustable from 6 mA to 20 A. For DC and mixed AC/DC systems, the trip value is adjustable from 10 mA to 10 A. Each channel is individually monitored with a connected current transformer, available in a wide range of sizes, shapes, and core types.

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  • Multi-channel ground-fault monitoring relay for grounded and high-resistance-grounded AC/DC systems
  • Monitor up to twelve separate channels with individually adjustable alarm trip values
  • Digital display with real-time readings and on-board menu
  • Harmonics analysis and selectable filtering options
  • Contact outputs and compatibility with Ethernet and Modbus communication gateways


  • Ground fault monitoring on grounded and high-resistance grounded AC/DC systems
  • Systems with variable frequency drives, inverters, and other power conversion equipment
  • General purpose DC systems, per NEC 250.167(B)
  • General power distribution
  • Motors and motor control centers
  • Control systems
  • Heat trace systems, per NEC 427.22 and CEC 62-116
  • Solar arrays, per NEC 690.41(B) (2017 edition), NEC 690.5 (2014 edition), and CEC 64-064(4)
  • Energy storage systems


Distinctive device features RCMS460-D…
Parameter setting function  
Address range 1…90







Measuring circuit

Measuring channels per device 12
CTAC…, CTUB100, CTBS25, WR…S(P), WS…, W…F series measuring current transformers  
CT monitoring  

Rated residual operating current I∆n2 (Alarm)

AC/DC sensitive 0…2000 Hz (Type B) 10 mA…10 A
pulsed DC sensitive 42…2000 Hz (Type A) 6 mA…20 A
pulsed DC sensitive 42…2000 Hz (Type A) for the channels 9…12 (RCMS4x0-D4/-L4) 100 mA…125 A
Rated residual operating current I∆n1 (prewarning) 10…100 %, min. 5 mA
Function selectable per channel off, <, >, I/O  
Cut-off frequency adjustable for personnel, plant and fire protection  
Preset function for I∆n2 and I/O  
Hysteresis 2…40 %
Factor for additional CT  
Switching elements Common alarm relay for all channels 2 x 1 changeover contact
Alarm relay per channel

Time response

Start-up delay 0…99 s  
Response delay tv, adjustable 0…999 s  
Operating time at I∆n = 1 x I∆n2: ≤ 180 ms  
I∆n = 5 x I∆n2: ≤ 30ms  




Displays, memory

Analysis of the harmonics (I∆, DC, THF)  
History memory 300 data records  
Data logger for 300 data records/ channel  
Internal clock  
Language English, German, French, Swedish  
Backlit graphics LC display  
7-segment display and LED line