AF0500 Series - Arc-Flash Relay

Find Littelfuse Arc Flash Protection
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The AF0500 is a microprocessor-based arc-flash protection relay that limits arc-fault damage by detecting the light from an arc flash and rapidly tripping the feeder breaker. The unit is well suited for switchgear, transformer, motor controls center and power converter applications. Sensors, inputs, and connections are health monitored to ensure fail-safe operation. A secondary solid-state trip circuit provides a redundant trip path. A USB port is used for configuration and access to event logs. The AF0500 arc-flash protection relay includes an Ethernet interface and supports Modbus TCP communication. Zone tripping, upstream breaker tripping and tie breaker tripping applications can be easily configured. A number of control inputs allows interconnection of multiple AF0500 units to form a system.


4 arc sensor inputs

Supports both point and fiber sensors

Arc-Flash trip time <1ms

Limits arc-flash damage and risk of injury

2 IGBT high speed trip outputs

Supports applications such as upstream breaker tripping or tie breaker tripping

Universal Power Supply 100-240 Vac, 24-48 Vdc, or 110-250
Vdc supply
Fail-safe system Continuous monitoring of optical sensors and inputs ensures protection
LED indication
(on unit and each sensor)
Trip and sensor status indicated both on relay and sensors
Discrete wire networking Multiple AF0500 units can be interconnected to form a system
USB interface Data logging and configuration software uses a USB interface with no drivers or software installation
Data logging On-board event recorder for system diagnostics (2048 log lines)
Ethernet interface Modbus® TCP communication

Access specifications, certifications, check availability and order parts below

Catalog #Supply
ApprovalsOutput OptionsRelay
AF0500-00100/240Three Form C (N.O./N.C.); One Form A (N.O.)UL cULus CE C-tick2 IGBT switchesFail-safe
Non Fail-safe
5.1H X 7.9W X 2.1D
AF0500-00-CC110/250Three Form C (N.O./N.C.); One Form A (N.O.)UL cULus CE C-tick2 IGBT switchesFail-safe
Non Fail-safe
5.1H X 7.9W X 2.1D

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