AFR-4 MV HV Switchgear Arc Flash Detection Relay with 4 Channels
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AFR-4 arc flash detection relay is a versatile and independently operating device for bay-based protection. It supports 4-channel arc signal detection and can configure multiple arc tripping modes, ensuring accurate and fast fault isolation. With a fast relay output speed up to 5ms, AFR-4 can minimize or eliminate arc flash damage, improving system safety and reliability. It can be used in various arc protection applications in low or medium-voltage power distribution systems.
AFR-4 also provides flash warning and dual criteria tripping mechanism (arc detection + current), providing a comprehensive solution for arc flash protection. Integrated RS485/Modbus communication enables seamless remote monitoring and control, which is ideal for modern power systems.
Features of the AFR-4 arc flash relay
≤5ms fast relay tripping;
Regional arc light detection;
Multiple combined tripping modes;
Circuit breaker failure protection;
4 channels of arc light signals detection;
Dual criteria for arc detection and overcurrent detection;
Integrated /RS485 MODBUS communication protocol;
Support ST visible light and ST ultraviolet sensor access.
Specification
| Working power supply | |
| Power supply | 85-265Vac/dc Optional 15-70Vdc (suggestion 24V/48Vdc system volt) |
| Power consumption | ≤8W |
| Current | |
| Rated current input | 5A, Frequency: 50Hz/60Hz; accuracy: 0.5 |
| Rated current output | 2.5mA, CT ratio: 2000:1 |
| Measuring range | Protection current: 0.06~10In |
| Error | ±2.5% |
| Linear range | 0~40A (Impedance: 20Ω) |
| Arc signal input | |
| Number of channels | 4 channels |
| Sensor connector type | ST (straight tip) fiber/ screw fixing |
| Sensor lens type | Passive physical lens |
| Transmission medium | Plastic optical fiber |
| Detection light type | Visible light/ UV light optional |
| Optical fiber length | 5m/10m/15m |
| Action time | |
| Arc trip (fast trip) | ≤5ms |
| Pure arc trip (relay output) | ≤8ms |
| Current+ arc trip | ≤15ms |
| Digital input (Opto-isolated) | |
| Quantity | 2 DI (For Block/ MT in) |
| Internal supply voltage | 24Vdc (Passive, dry contact; No need external voltage) |
| Loop current | 5-10mA |
| Max. power consumption | 200mW |
| Action time | Max. 18μs |
| Digital output | |
| Trip output signal | Pulse signal, pulse width 120ms |
| Fast trip relay (IGBT) (1*Relay for Arc trip, NO) | Load capacity: 10A@250Vac. Max. switching current: 10 A. Max. switching voltage: 277Vac.
In DC power supply, relay spec: Load capacity: 12A@24Vdc. Max. switching current: 12 A. Max. switching voltage: 300Vdc. |
| Standard trip relay (4* Relay for Arc trip, NO. 1* Relay for Arc alarm, NO 1* Relay for MT out) | |
| SPDT contact (1*Relay for device self-test, NC) | |
| Communication | |
| Communication Interface | 1 channel RS485, photoelectric isolation, with lightning protection |
| Baud rate | 4800, 9600bps (default),19200, 38400 |
| Communication protocol | Modbus RTU |
| Environment | |
| Working temperature | -10 ~ +55°C |
| Storage temperature | -25 ~ +70°C, humidity: 5~95%RH |
| Atmospheric pressure | 60kPa~106kPa |
Arc sensor specification:
| Sensor type | Visible light sensor | UV light sensor |
| Sensitivity type | Full spectrum | UV spectrum |
| Spectral response bandwidth | 280nm ~ 550nm | 280nm ~ 400nm |
| Optical threshold | 5-20klux (error: < ±20%) | 1-10mw/cm2 (error: < ±20%) |
| Monitoring angle | -120°~ 120° | -120°~ 120° |
| Angle decay rate | ≤20% | ≤10% |
| Operating temperature | -30~70°C | -40~85°C |
| Interface type | ST fiber optic/screw fixing | ST optical fiber |
| Optical fiber length | 5/10/15 meters | 5/10/15 meters |
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