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1-Phase Current Control Relays

The control relay RM17JC00MW is designed to monitor ∿ currents

These control relays allow:

  • Integrated current transformer
  • Measurement range 2…20 A
  • Choice of action on the output relay
  • Clip-on mounting on a rail

They feature a control status indicator LED.

RM17JC00MW

Applications

  • Load state control of motors and generators
  • Control of current drawn by a 3-phase motor
  • Monitoring of heating or lighting circuits
  • Control of pump draining (undercurrent)
  • Control of overtorque (crushers)
  • Monitoring of electromagnetic brakes or clutches

Description

 

1. Overcurrent setting potentiometer

2. Spring for clip-on mounting on 35 mm/1.38 in. rail

RM17JC00MW_desc

Operating Principles

RM17JC00MW

Control relay RM17JC00MW is:

  • equipped with an integrated current transformer
  • fault signaling is by LED

An adjustable time delay on threshold crossing, provides immunity to transients, and helps prevent spurious triggering of the output relay

RM17JC00MW_legend

Overcurrent detection

  • Relay RM17JC00MW controls overcurrent.
  • The relay closes when the current exceeds the threshold setting on the front panel and opens when it drops below the threshold minus the hysteresis.
  • When terminal Y1 is linked to A1 (+), the output is reversed. The relay opens when the current exceeds the threshold setting on the front panel and closes again when it drops below the hysteresis value.
RM17JC00MW_diagram

1-phase current control relays – RM22JA and RM35JA

RM22JA and RM35JA

These control relays enable:

  • Automatic or ∿ recognition
  • Selection between overcurrent and undercurrent
  • Measurement as a true rms value
  • Selectable memory function
  • Clip-on mounting on a rail

They feature:

  • Dial pointer LED indicator for relay power ON status
  • Relay output status LED
  • A sealable cover to help protect the settings
  • A control status indicator LED
RM22JA21MR
RM35JA32MT

Applications

  • Excitation control of DC machines
  • Load state control of motors and generators
  • Control of current drawn by a 3-phase motor
  • Monitoring of heating or lighting circuits
  • Control of pump draining (undercurrent)
  • Control of overtorque (crushers)
  • Monitoring of electromagnetic brakes or clutches

Description

RM22JA21MR_desc
RM35JA32MR_desc
RM22JA31MR_desc
RM35JA32MT_desc

1. Configuration: selection of operating mode e <I (undercurrent), >I (overcurrent), >I> (overcurrent and undercurrent), MEMORY – NO MEMORY (with or without memory)

2.  Current threshold setting potentiometer I%

3a. Hysteresis adjustment potentiometer Hys

3b.  Hysteresis/overcurrent and undercurrent window mode adjustment potentiometer Hys/>I>

4. Time delay adjustment potentiometer Tt

5. Diagnostic button 

6. Overcurrent setting potentiometer >I

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