AG Series Ground Fault Detectors help protect people, products, and processes from damage by ground fault conditions by monitoring all current-carrying conductors in grounded single- and three-phase delta or wye systems.
Ground Fault Protection Applications
Personnel Protection (typically 5 mA)
- Detects sensitive ground fault conditions, which may be injurious to personnel and processes.
- Functions as sensor and alarm trigger when part of an overall ground fault protection system.
Equipment Protection (typically 10 mA or 30 mA)
- For applications where personal protection is not the primary concern, higher setpoint capability helps eliminate nuiscance tripping while still providing adequate ground fault detection to protect machine electronics.
Regulatory
- Meets requirements as stipulated by governmental and industrial regulatory groups for ground fault sensing.
Insulation Breakdown Monitoring
Ground Fault Protection Features
Broad Range of Options to Match Application Needs
- N.O./N.C. solid-state switch or mechanical relay outputs.
- Normally energized or normally de-energized contacts.
- Noise Immunity option for use in EMI/RFI sensitive environments.
Setpoint Options Maximize Ease-of-Use
- Field-selectable 5 mA, 10 mA or 30 mA setpoints on the AG3 "Tri-set" model makes user adjustments fast, sure and convenient.
- Single factory-calibrated setpoints available form 5 mA to 950 mA.
Compatible with Standard Equipment
- Applicable on single- and three-phase systems.
- Ideal for use with shunt trip breakers.
- Magnetically isolated from monitored circuit and control power.
UL/cUL and CE Approved
"Zero Sum" Operating Principle: In three-phase delta and wye systems, under normal conditions current in the 'hot' leg of a two-wire load is equal in magnitude but opposite in sign to the current in the neutral leg. As a result, the electromagnetic fields surrounding these two conductors cancel, producing a "zero sum current." As soon as current leaks to ground (fault condition) the two currents become imbalanced and a net magnetic field results. AG Series detectors monitor this field and trip alarm contacts when the leakage rises above setpoint.
Available Models
AG Series with Solid-state Outputs offer the benefit of reliable, long-lasting solid-state switches. Sold-state design provides unlimited switch operating life, superior resistance to shock and vibration, zero off-state leakage, high switch speeds and high input-output isolation. Available in solid-core case with screw terminals.
AG Series with Mechanical Outputs are available in solid- core cases with a choice between a N.O. or N.C. SPST latching relay and a SPDT Form C relay with auto-reset. All mechanical models can be ordered with factory-set, field-adjustable setpoint or with a "Tri-set" option, which provides three factory-set setpoints. A noise immunity option is available for applications in harsh EMI/RFI environment.
Latching Models (-LA Option) power up initially in the rest (normal) mode. If there is a fault condition or the test button is pushed, the output contacts will change state and latch. The output will remain latched regardless of whether the fault is cleared or control power is removed. To reset the output apply a momentary contact across "reset" terminals.
| Ground Fault Protection Dimensions |
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Solid-State
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Mechanical
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![NK_AG_Series_Image2]() |
| Connections |
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AG Series
Solid-State Switch
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![NK_AG_Series_Image3]() |
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AG Series
Mechanical Relay
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![NK_AG_Series_Image4]() |