RG ALLEN CO

Standard Metal Oxide Varistors (MOVs)

• Zinc Oxide Varistors

For reliable operation, transient voltage suppression should be addressed early in the design process. This is especially important as modern electronic components are increasingly vulnerable to electrical transients. Designers must identify potential transient threats and ensure compliance with product standards and regulations while choosing appropriate solutions.

MOVs are variable resistors that adjust resistance based on the applied voltage. When the voltage increases, the resistance decreases, and vice versa, making them ideal for protecting circuits from voltage surges. They are commonly used as surge protectors in electrical networks.

Features:

• Maida’s Standard Series offers a comprehensive range of radial-leaded varistors.
• Body sizes: 5mm to 25mm.
• Wide operating voltage range (MCOV): 11VAC to 1000VAC (custom voltages available).
• RoHS, REACH, and Halogen-Free compliant.
• UL, cUL, and VDE approvals.
• Designed for low and medium voltage handling.

Applications:

• AC Line Voltage applications.
• Power supplies, UPS systems.
• AC power taps and meters.
• Lighting products.
• Devices requiring surge protection from high currents.

Key Specifications:

• Clamping Voltage: Voltage where significant conduction begins.
• Rated Voltage: Maximum AC or DC voltage the varistor can handle safely.
• Response Time: Time taken to begin conduction after a pulse, typically <50ns.
• Capacitance: Generally 100-1000pF, important to consider in high-frequency applications.
• Standby Current: Current drawn when operating below clamping voltage.

Operating Specifications:

• Operating Temperature: -40°C to +85°C.
• MCOV Range: 11VAC to 1000VAC.
• Max DC Leakage: 200uA at rated VDC.
• Peak Current Rating: Up to 18,000A (1 pulse, 8/20μs).
• Impulse Response Time: <50ns.
• Coating Hipot: 2500VDC minimum.
• Coating Insulation Resistance: 1000MΩ minimum.
• Current/Energy Derating: -2.5% per °C above 85°C.