AFR-4 arc flash detection relay is a versatile and independently operating device for bay based protection. It supports 4-channels arc signal detection and can configuration multiple arc tripping modes, ensuring accurate and fast fault isolation. With a fast relay output speed up to 5ms, AFR-4 can minimize or completely 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 system.
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.
AFR-4 arc flash detection relay is a versatile and independently operating device for bay based protection. It supports 4-channels arc signal detection and can configuration multiple arc tripping modes, ensuring accurate and fast fault isolation. With a fast relay output speed up to 5ms, AFR-4 can minimize or completely 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 system.
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.
| 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 | 8000lux (±20%) | 5mw/cm² (±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 |
Product dimension：W*H*D: 152*105*50mm, Din-rail mount: 35mm
Panel hole size:
Front view Side view
