Earth Fault Relay

Protection Relays

Definite Time Earth Fault Relay (Panel Mounting 96x96mm)
Brand: Broyce Control
Type: P-9620
Definite Time (DT) Earth Fault Relay.
  • True R.M.S. measurements
  • Adjustable Low-set tripping threshold
  • Adjustable High-set tripping threshold with option to disable
  • Adjustable Definite Time setting (applicable to Low-set triggering only)
  • Instantaneous tripping on High-set triggering
  • Test and Reset button for simulating and clearing of fault condition
  • Red LED indication of Low-set or High-set triggering and tripping
  • Green LED indication for Auxiliary power supply presence
  • Microprocessor based (self checking) with non-volatile memory
  • Terminals suitable for 2 x 2.5mm2 wires (complete with protective cover)
The P9620 (from the P9600 series family of IDMT/DT relays) is a microprocessor based relay designed to monitor and detect Earth faults in 3-phase applications. Typically the P9620 is wired in conjunction with external current transformers of the feeder to be protected.

The adjustments and indicators are laid out such to help the user during set-up and fault
finding. The adjustment for the Lowset for example has its corresponding red LED positioned above it so it is clear to which function this LED relates to. The same also applies to the Highset adjustment and LED. Adjustment and LED operation is explained further on the next page.
The adjustable time delay Delay is assigned to the Lowset triggering only. The Highset does not have any adjustable delay and hence will trip instantaneously if triggered. If required, the Highset can be set to disabled.
A Test mode is provided (also accessible with the tamperproof transparent cover closed) to
confirm the correct operation of the internal relay. The relay will energise when the “TEST” button is pressed and de-energise when the “RESET” button is pressed.


Supply voltage Un (1, 2):
115VAC ±15%
230VAC ±15%
(Voltage should be specified at time of ordering)
Rated frequency: 50/60Hz
Isolation: Over voltage cat. III
Rated impulse withstand voltage: 4kV (1.2 / 50μS) IEC 60664
Power consumption: 3W max.
Rated current input In: 5A (directly connected)
Rated frequency: 50Hz
Burden: <0.4VA @ In
Overload: 4 x In (continuous)
External CT’s (15, 16): Class P recommended. (with 5A secondary)
Earth fault settings: Low-set trip (Io>): 0.10 – 2.0A (2 – 40%)
Low-set definite time (t>): 0.05 – 1.0s
High-set trip (Io>>): x1 – x10 or disable (∞)
High-set definite time: Instantaneous (<50mS)
Pick up value: +2% of trip setting
Protection thresholds:±5%
Time delay (DT): ±5% (with a minimum of 50mS)
Repeat accuracy: ±0.5% @ constant conditions
Ambient temperature: -10 to +60°C
Relative humidity: +95% (non-condensing)
Output: (RL1 -3, 4, 5): 1 x SPDT relay
Output rating: AC1 250V 8A (2000VA)
AC15 250V 5A (1250VA)
DC1 25V 8A (200W)
Electrical life: ≥150,000 ops at rated load
Dielectric voltage: 2kV AC (rms) IEC 60947-1
Rated impulse withstand voltage: 4kV (1.2 / 50μS) IEC 60664

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Author: mavinelectric

Electrical Power and Control Services

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