حفاظت مدار وریستور (ام او وی)

Product Attributes

Introduction

Ring varistors are used in a wide range of applications from micro motor noise absorption to the protection of circuit contacts. TDK has greatly improved the electrical and physical performances of these varistors to meet the latest demands. This varistor line covers the traditional shapes and dimensions as well as the more varied and specialized applications.

Features

• The temperature characteristics of the varistor voltage (E10 value) are positive. This prevents the varistor voltage from decreasing at high temperatures and from large currents flowing through the varistor. Therefore, these varistors remove design obstacles by eliminating the need for setting the room temperature varistor voltage (E10 value) higher—a measure that compromises noise reduction levels.
• The VAR-18 series has also eliminated the problem of the noise level being amplified at low-temperatures and having a negative impact on the life of the motor.
• Because the VAR-18 series has the same large capacitance as the conventional varistors, it has excellent functions to eliminate and control motor noise in high frequency bands.
• Because copper electrodes are used and the heat resistance of the ceramic elements has been improved, there is no concern for electrode erosion or thermal crack even at the higher soldering temperatures that are used in lead-free soldering.
• The ceramic element has excellent flexure strength as is suitable for automatic motor assembly.
• The varistors in this series come in a wide range of dimensions and so can be accurately used for almost all motors.
• This lineup includes side-surface electrode varistors that can be used with ultra-compact micro motors.
• Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.