561K20D 20mm Metal Zinc Oxide Varistor

The 561K20D MOV varistor is a metal oxide-based transient voltage suppression component designed to protect electrical systems from high-energy surge events. Operating across a varistor voltage range of 504 V to 616 V, it clamps voltage spikes at approximately 925 V to prevent damage to downstream circuits. This component features a 20 mm radial disc design, capable of withstanding surge currents up to 6.5 kA and energy discharges around 215 joules, making it ideal for use in power lines, industrial automation, and high-voltage consumer equipment.

Thanks to its zinc oxide ceramic construction, the varistor reacts rapidly to voltage transients with minimal response time and recovers automatically without the need for resetting. This makes the 561K20D MOV varistor especially useful in applications such as surge protection for relays, motor controls, lighting systems, and sensitive semiconductor interfaces. It operates within a wide ambient temperature range from –40 °C to +85 °C, supporting long-term stability under continuous electrical stress.

The device conforms to RoHS standards and is certified by UL, CSA, and VDE, ensuring its reliability in critical electrical designs. Its compact size, high surge endurance, and non-polarized structure allow for versatile PCB placement in both commercial and industrial-grade electronics.

Key Specs

Model: 561K20D MOV Varistor Varistor Voltage (V₁mA): ~504 V–616 V Clamping Voltage: ~925 V Maximum Surge Current: 6.5 kA Energy Rating: ~215 J Disc Diameter: 20 mm Operating Temperature: –40 °C to +85 °C Compliance: RoHS, UL/CSA/VDE certified Construction: Zinc oxide metal-oxide varistor disk