Intro Information 4Varistors 6 Selector Chart 6Product Datasheets 8 General Product Information 31 Product Standard / Definitions / CE-Marking / Conformity 32National approvals 32Varistors 33 Type Index 39Index by Order Numbers 38 >

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With the development, production and sales of active and passive components for electronic and electromechanical applications SCHURTER is a leading global industry partner. The SCHURTER Group leads the way in its four strategic business areas, using its innovative strength and cutting- edge technology to provide customers with intelligent practical solutions. Radial leaded varistors (MOV) supports equipment manufacturers to pass the Surge Test Condition according to IEC 61000-4-5. Fuses 7 www.schurter.com >

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Product Standard / Definitions / CE-Marking / Conformity 32National approvals 32Varistors 33 31 www.schurter.com >

(Mark) European Norms Electrical Certification (Mark) VDE Verband Deutscher Elektrotechniker > (Certificate of conformity with factory surveillance) UMF Universal Modular Fuse meets the standard IEC 60127-4 > (Recognition) UL Underwriters Laboratories (USA, Canada) (Listing) UL Underwriters Laboratories (USA, Canada) (Recognition) UL Underwriters Laboratories (USA) > (Listing) UL Underwriters Laboratories (USA, Canada) > CSA Canadian Standard Association, Component Acceptance Service > CSA Canadian Standard Association CCC China Compulsory Certification PSE Japan Electrical Safety & Environment...

Introduction Varistors (Variable Resistors) are voltage-dependent, nonlinear resi-stors with a symmetrical current-voltage characteristic curve (Figure 1) where the impedance decreases when the voltage decreases. Va- ristors are often also referred to as MOV (Metal Oxide Varistors), ZnO (Zinc Oxide Varistors), VDR (Voltage Dependent Resistors) and TVSS (Transient Voltage Surge Suppressors). > U 1000 600 200-200-600 -1000-40 -2020 40I Figure 3: Current flow during normal operation (high impedance) > Surge Figure 1: Voltage/current curve, green: Normal operation, yellow: Con-ductive in the event...

Approvals > Fuse Fuse Fuse The following component standards apply to zinc oxide varistors: > UL 1449Transient Voltage Surge Suppressors UL 1414Across-the-Line Components 3 CSA C22.2Accessories and Parts for Electronic Equipment Figure 11: AC 3-phase circuit > FuseFuseFuseDevice to protect VaristorVaristor ThermalFuse Varistor Typical Application Circuit Diagrams > Varistor Figure 12: AC 3-phase circuit with thermal fuse > F use Device to protect Varistor Varistor Thermal Fuse Figure 13: Data lines > Figure 10: AC or DC circuit with thermal fuse Figure 14: Switch-off protection >

Figure 15: Switch protection (arc suppression) Figure 18: Standard Waveform (8/20 ˩ s) according to IEC 60060 Selection Procedure Step 1: Establishing the varistors voltageThe lowest varistor voltage depends on the highest AC or DC voltage applied. Usually, the tolerance range is assumed to be between +/- 10 and 20%, by which the voltage supply may fluctuate. The following varistor voltages are commonly used:- 24 VDC secondary voltage Recommended varistor voltage: 26 VDC (AVTS, 0070.20xx.xx) 31 VDC (AVTS, 0070.25xx.xx) 38 VDC (AVTS, 0070.30xx.xx)- 120 VAC line voltage (USA Recommended varistor...

Step 2: Establishing the maximum permissible peak current Step 3: Establishing energy absorption Step 4: Establishing power dissipation Step 5: Testing the protective performance in practice All important information regarding steps 2 to 4 can be found in the sec-tion on ParametersӔ. >

AVTP Varistors 15 AVTS Varistors 8 AVTT Varistors 23 >

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