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Current Window Comparators
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Rhomberg current window comparators, are used to monitor AC or DC current, and switch a relay contact at a pre-determined level, primarily used for simultaneous overcurrent and undercurrent protection. (Available in 11-pin plug-in or DIN rail format)
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SP121
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Current Monitoring Relay - Current Window Comparator - 200mA, 60mV, 150mV, 5V inputs
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Overload and/or Underload monitoring & protection
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Features
- 11-pin plug-in.
- Fail-to-safe design.
- Combined overload and underload detection.
- 0-200mA AC (RMS)/DC 60mV/150mV (DC Shunt) 0-5V AC (RMS)/DC
- Direct interface to DC shunt resistors.
- Internal shunt for direct in-line sensing current up to 200mA (AC/DC)
- Fixed hysteresis: 2%.
- Start-up delay 10 sec fixed.
- Selectable latching (ie manual or auto reset).
- Relay ON LED.
- 10A SPDT relay output.
- Requires optional S3-B 11-pin base.
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Data Sheet
More Info
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SP123
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Single Phase Current Monitoring Relay - Current Window Comparator 1A/ 5A AC (rms)
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Overload and/or Underload monitoring & protection
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Features
- 11-pin plug-in.
- Fail-to-safe design.
- Adjustable time delay on trip 0.1 to 10 seconds.
- Combined overload and underload detection.
- 1A or 5A, AC input range (programmable).
- Internal shunt for direct in-line current sensing (AC).
- Direct interface with conventional current transformers.
- Fixed hysteresis: 2%.
- Separate adjustment of overload and underload setpoints.
- Adjustable response time on trip (0.1 to 10 seconds).
- Start-up delay 10 sec fixed.
- Selectable latching (ie manual or auto reset).
- LED indication of Relay ON and fault type.
- 10A SPDT relay output.
- Supersedes SP120
- Requires optional S3-B 11-pin base.
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Data Sheet
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