Ground faults can be dangerous. A short to ground in a solidly-grounded system creates large currents that can damage equipment and cause a shutdown. A ground fault can also create an arc flash, which can cause serious injury to nearby personnel as well as damage to equipment.
A protection relay is a smart device that receives inputs, compares them to set points, and provides outputs. Inputs can include current, voltage, resistance, or temperature.
Arcing and arc flashes are uncontrolled, intense, luminous discharges of electrical energy that occur when electric current flows across what is normally an insulating medium. The most common cause of arc faults is insulation failure.
Resistance grounding protects a system against transient overvoltages caused by intermittent ground faults and it provides a method to locate ground faults. (Transient overvoltages and inability to locate ground faults are the most common safety issues with ungrounded systems.)
A current transformer is defined as a transformer that produces a current in its secondary circuit that is in proportion to current in its primary circuit.
Read more to use this reference tool for Littelfuse's Glossary of Terms.
A relay can have several ways of communicating that a decision has been made. Typically the relay will operate a switch (relay contact) to indicate that an input has surpassed a setting, or the relay can provide notification through visual feedback such as a meter or LED.
Littelfuse Enhanced Overload Relays monitor line-side voltages to prevent starting equipment while fault conditions exist! Unlike standard thermal overload relays, which only protect against load-side faults, SymCom's 777 family of enhanced overload relays also act as "smart sensors" for incoming power lines.
Why rely on a basic overload relay to protect your motors/pumps and processes? To ensure they stay up and running, here are three inexpensive options to consider for upgrading your electrical protection.
arking the third consecutive year Littelfuse products have been recognized in the program, the finalists qualified are: MP8000 Bluetooth Overload Relays, AF0100 Arc-Flash Relays and POWR-SPEED PSR High Speed Fuses.
Power must be applied at all times. When the level in the tank rises to the normal level, the Lead Float Switch closes. Pump "A" is turned on via Pump "A" contactor, and will remain in this condition until the Lead Float Switch opens. When the Lead Float Switch opens, the ARP relay contacts transfer.
Littelfuse, Inc., the global leader in circuit protection, announces that the AF0500 Arc-Flash Relay is a finalist for Plant Engineering’s 2015 Product of the Year Awards honoring outstanding achievements in innovative products for manufacturing.
SymCom Incorporated announced today that the owners of SymCom have acquired SSAC, a leader in low-voltage products, from ABB. SSAC Management and Employees will continue to operate from the Baldwinsville, NY facility as SSAC, LLC.
