Expertise Applied | Answers Delivered IMPROVE SAFETY AND RELIABILITY WITH INSTANT ARC-FLASH DETECTION

Case Study Had this relay not been there, they were looking at $800,000 to $1 million of cost... —Tim Deschamp, Evans Enterprises, USA Littelfuse Arc-Flash Relay Saves Plant from Catastrophic Damage Tim Deschamp from Evans Enterprises was working with a customer to help them resolve a critical issue with an electrical hazard in their furnace control room. An earlier arc-flash analysis had determined that one 480-volt cabinet, which was fed from a 3500 kVA transformer, exceeded an arc-flash PPE Category 4 (PPE 4). To be able to work on the cabinet or lower required PPE, Deschamp needed to lower...

Fast Arc-Flash Detection in Less Than 1 ms Minimize Damage. Circuit breakers (CBs) or overcurrent protection devices (OCPDs) alone do not provide optimal protection for your personnel and equipment. The Littelfuse Arc-Flash Relays rapidly detect an arc flash and send a trip signal to interrupt power. rCT2i rCT3i PGA-LS10 Point Sensor Inputs PGA-LS20/PGA-LS30 Fiber-Optic Sensor Inputs *Backup battery not included Simple Plug & Play Installation and Maintenance The Littelfuse Arc-Flash Relays and sensors are easily retrofitted into existing switchgear or pre-installed in new equipment with little...

Control Power 100-240 VAC/VDC In the Zone The AF0500 Arc-Flash Relay provides tie breaker and zone tripping capabilities -one relay trips two separate zones. With unrestricted scalability, multiple AF0500 relays can be connected to cover multiple zones.

Technology AF0100 Arc-Flash Relay Unit Health Digital Inputs/Outputs 2 Arc-Flash Sensor Inputs Control Power 100-240 VAC/VDC Mighty Small Smaller incident energy. Smaller footprint. Smaller cost. The AF0100 delivers leading arc-flash technology at a size and price to make improved electrical safety accessible for everyone.

Switchgear Protection The PGR-8800 monitors each cabinet with a PGA-LS10 point sensor, providing arc-flash protection and fault location indication. The entire length of the back bus bar is monitored by a PGA-LS20 or PGA-LS30 fiberoptic sensor. The PGR-8800 uses current transformers to monitor the current, and trips the local “feeder” circuit breaker only when high amounts of light and current are present. The PGR-8800 is also configured to only trip the upstream “main” breaker if the local circuit breaker fails to open. Fiber-Optic Sensor Transmitter Receiver Control Power & Battery Back-up...

To Electrical Bus/Other Generators Fiber-Optic Sensor Generator Protection Generators are often the last line of defense in powering and protecting critical applications. The generator breaker is the last line of defense protecting the generator itself: there is no protection at all between the line side of the breaker and the generator. The AF0100 includes two Form-C Trip outputs that quickly respond to an arc flash, turning off the generator using the AVR or other control circuits and disconnecting from the utility or parallel generators by tripping the generator breaker. The AF0100 can be...

Reliable Operation with Built-In Redundancies When you are entrusting a safety device to protect equipment from catastrophic damage, it is important to know that it will operate as expected. Littelfuse Arc-Flash Relays do this by having built-in redundancies and health monitors, making maintenance and installation tasks faster, more efficient and helping to minimize downtime. Redundant Internal Trip Path Two internal trip paths for added reliability—if the microprocessor trip path fails, the backup analog trip path will seamlessly take over, sending an alarm notification to operators ■■Backup...

Sensor Design Point Light Sensor ARC-FLASH RELAY Line-of-sight light sensor detects an arc as small as 3 kA in a 2-meter half-sphere radius. g Visual LED indication for “Ready” or “Tripped” state to assist with fault location g Robust sensor design can withstand a detected arc-flash event g Sensor can be installed up to 50 m (164 ft) away from relay; electrical cable can be cut and easily re-terminated in the field Fiber-Optic Light Sensor The 360° light sensor detects light throughout the entire length of the fiber. Ideal to protect bus bars, multiple compartment installations like motor control...

FAQ Do arc-flash relays lower the Personal Protective Equipment (PPE) required? In order to lower the amount of PPE required, the incident energy must be reduced. There are two ways to lower the incident energy of an arc-flash event, reducing the fault current or the clearing time and reducing the available energy. Reducing the available energy can be achieved by using current-limiting fuses and, for single-phase faults, resistance grounding. Reducing the clearing time typically is not possible when using overcurrent protection due to system coordination requirements. Current-based protection...

AF0500 Arc-Flash Relay Relay Part Nos. Sensor Inputs Sensor Part Nos. Technical Specifications IEEE Device No. Input Voltage Dimensions Optical Trip Settings Trip Coil Outputs PGR-8800 Arc-Flash Relay Relay Part Nos. Sensor Inputs Sensor Part Nos. IEEE Device No. Input Voltage Dimensions Optical Trip Settings Trip Coil Output Relay Outputs Communications System Expansion Sensors Battery Approvals Warranty Mounting PGR-8800-00 PGR-8800-00-CC (conformal coating) 6 light sensor inputs for PGA-LS10, PGA-LS20 and PGA-LS30 sensors PGA-LS10 (Point) PGA-LS20 (Fiber-Optic) PGA-LS30 (Fiber-Optic) Overcurrent...

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