Primary AC Circuit Protection

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Primary AC Circuit Protection - Mixed Media

All electrical and electronic devices can be damaged by voltage transients, which are forever present in the form of voltage surges from the AC mains power line and electrical distribution systems in general. There are a wide range of VAC circuit protection devices available to protect the offline power supply circuit on the primary side, including: surge protection devices (SPDs), to be deployed externally to the system; power TVS (transient voltage suppressor) diodes for AC line protection; AC transient protectors, deployed across the inputs for AC-DC supplies; metal oxide varistors (MOVs), which protect against overvoltage transients such as lightning, power contact and power induction; gas discharge tubes (GDTs), which are used to protect personnel and sensitive equipment from hazardous transient voltages; and Multifuse® resettable fuses for overcurrent surge protection.

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Primary AC Circuit Protection - Table

Product Type	Application	Download datasheet and buy online	Features Overview
GMOV™ components	Critical AC power applications White goods Motor drives AC inverters LED lighting and signage Surge Protective Devices (SPDs)	Download BUY ONLINE	AC voltage ratings 175V - 555V Nominal surge ratings 3kA – 5kA – 8kA -40°C to +125°C operation Low leakage current Low capacitance and insertion loss Stable performance throughout life Design kit available for quick-turn prototype testing UL Listed UL 1449 Type 4 CA RoHS compliant*
Surge Protective Devices	Main AC service disconnect - line side (Model 1251) Main AC service disconnect - load side (Model 1252) Indoor or outdoor AC power installations Industrial/commercial Electrical service entrance Branch panels	Download REQUEST QUOTE	Hybrid protection technology Extremely low leakage current in off -state LED indicator and audible alarm Thermal protection NEMA 4X enclosure Panel or bracket mounting RoHS compliant Multi-pole uni-block design DIN Rail mountable
Power TVS Diodes	High power DC bus protection Exposed AC/DC power supplies (in wireless base stations, etc.) AC line protection	Download BUY ONLINE	380 V or 430 V standoff voltage Very high surge current protection (3 kA @ 25 °C) Low clamping voltage under surge Excellent surge performance vs. temperature Bidirectional TVS Surface mount package
AC Transient Protector (ACTP)	Offline power supplies AC power inputs	Download BUY ONLINE	Aids in compliance with IEC 61000-4-5 up to 2.5 kV Precise and stable voltage Low voltage undershoot under surge conditions RoHS compliant* *RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Metal Oxide Varistor (MOVs)	Power supplies Power systems Line voltage Telecom systems White goods / appliances	Download BUY ONLINE	High voltage rating High current rating Bidirectional Surge protection Fast response time
Gas Discharge Tube (GDTs)	Telecommunications, customer premises equipment (CPE) and network equipment Industrial electronics Power supplies Data communications Consumer electronics Medical equipment	Download BUY ONLINE	Wide range of packages 2-and 3-electrode designs Low leakage Low capacitance High surge current ratings Switch-Grade Fail-Short available on select models
PTC Resettable Fuses: Multifuse®	Protection of automotive circuitry including engine control modules Overcurrent surge protection of electronic equipment required to operate at high operating temperature ranges Resettable fault protection of general electronic equipment	Download BUY ONLINE	Fuses at 120 V or 240 V E24 resistance values RoHS compliant* *RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Fusible Resistor	White goods Inverters Lighting Metering	Download BUY ONLINE	High voltage rating High current rating Bidirectional Surge protection Fast response time