Overview of ZA Series Radial Lead Varistors
Littelfuse, Inc. presents the ZA Series of transient voltage surge suppressors, which are radial leaded varistors (MOVs) designed for safeguarding low and medium-voltage circuits and systems. These varistors find applications in various settings including motor control, telecommunications, solenoids, and power supply circuits, where they are critical in preserving circuit integrity and preventing damage to circuit board components.
Product Features
The ZA Series is known for its wide operating voltage range, with AC voltage ratings spanning 4V to 460V and DC voltage ratings from 5.5V to 615V. No derating is required up to 85°C ambient temperature, making these varistors suitable for a variety of environmental conditions. They are lead-free, halogen-free, and RoHS compliant, adhering to the latest environmental regulations.
These varistors come in five different model sizes: 5mm, 7mm, 10mm, 14mm, and 20mm, allowing for flexible application across different circuit board designs. Packaging options include tape and reel or bulk pack, with standard lead form options available for ease of incorporation into various design layouts.
Approval Standards and Ratings
The ZA Series has received certifications from recognized agencies such as UL (E320116) and complies with standards including UL1449, CECC 42201-006, IEC 61051-1, IEC 61051-2, and IEC 60950-1 (Annex Q).
Maximum rating specifications are detailed for different models within the series, with a broad range of parameters detailed in charts to accommodate various designs and requirements.
Absolute Maximum Ratings
Critical to the selection process for engineers and designers, the datasheet lists absolute maximum ratings for the series. This includes:
steady-state applied voltages with AC in the range of 4 to 460V and DC spanning 5.5 to 615V;
peak pulse current capability from 50 to 6500A (for 8/20µs current wave);
single pulse energy range from 0.1 to 52J (for 10/1000µs current wave); plus operational and storage temperature ranges from -55°C to +125°C.
An important caution is noted regarding the potential for permanent damage if the varistors are subjected to stresses beyond those listed in the “Absolute Maximum Ratings”.
The datasheet concludes with the assurance of Littelfuse, Inc.‘s commitment to continuous product improvement, noting that specifications may be subject to change.
References:
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