“ZNR” Transient/Surge Absorbors, Type E, Type CK, SC

“ZNR” Transient/Surge Absorbers, Type E “ZNR” Transient/Surge Absorbers, Type CK, SC

Precautions for Handling

1.Precautions for Safety

The “ZNR” Transient/Surge Absorbers (hereafter referred to as “The ZNR Varistors”) may fail in a short-circuit mode or in an open-circuit mode, when subjected to severe conditions of electrical, environmental and/or mechanical stresses beyond their specified “Ratings” and specified “Conditions”, resulting in burnout, flaming or glowing in the worst case.

Following “Precautions for Safety” and “Application Notes” shall be taken in your major consideration. If you have a question about the “Precautions for Handling”, please contact our engineering section or factory.

1.1Operating Conditions

1.1.1The ZNR Varistors shall not be operated beyond the specified “Ratings” and “Environmental Conditions” in the Catalog or the Specifications to prevent them from deterioration, breakdown, flaming or glowing.

●The ZNR Varistors shall not be operated exceeding the specified “Maximum Allowable Voltage” in the Catalog or the Specification.

●The ZNR Varistors shall not be subjected to energy levels above their specified “Maximum Energy Ratings” in the Catalog or the Specifications.

●In case of application to repeated surge/ overvoltages, the ZNR Varistors shall not be subjected to surge currents and energy levels above the specified maximum ratings in “Impulse Life Rating” in the Catalog or the Specifications.

●When surge/overvoltages are intermittently applied to the ZNR Varistors with short durations, the devices shall not be operated beyond the specified “Rated Power” in the Catalog or the Specifications.

●The ZNR Varistors shall not be operated beyond the specified “Operating Temperature Range” in the Catalog or the Specifications.

●It is recommended that the ZNR Varistors, if not fused, shall be located away from other combustible components.

1.1.2The ZNR Varistor shall be operated correctly under following conditions to prevent Varistors from causing mechanical damages and ruptures and to protect human from serious injuries;

●The ZNR Varistors shall not be operated exceeding the specified “Maximum Allowable Voltage Ratings” in the Catalog.

●The ZNR Varistors shall not be operated beyond the “Maximum Peak Current Ratings” in the Catalog.

●S o me safet y countermeasure such as a protective case covering the Varistor is recommended, if necessary.

1.1.3When the ZNR Varistors are applied to between a live part and a metallic chassis of equipment, following safety countermeasures shall be taken to protect human from electric shock.

A)The metallic chassis shall be earthed to the ground.

B)The live part shall be equipped with a protective cover for preventing electric shock.

●Recommendation fuse

Series

ERZC20EK￿￿￿

ERZC32￿K￿￿￿

ERZVS34C￿￿￿

ERZC40CK￿￿￿

Current Fuse

10 A max.

20 A max.

20 A max.

(Line - Line)

 

 

 

 

 

 

 

Thermal. Fuse

100 to 120 °C 5 A

100 to 120 °C 10 A

100 to 120 °C 10 A

(Line - Ground)

 

 

 

 

✽Fuses shall use rated voltages appropriate for circuits.

✽Finally, confirm that the secondary disaster does not occur even if the ZNR mounted on equipment breaks.

✽Set a thermal fuse to get high thermal conductivity with ZNR.

2. Application Notes

2.1 Protective Devices for Varistors

2.1.1The ZNR Varistors shall be protected from serious accidents due to unexpected physical phenomenor by following safety countermeasures.

●In case of “Across - the Line Use”, the ZNR Varistors shall be protected by connecting a ground fault circuit interrupter of fusing in series to the devices. (See Table 1)

●In case of “Line to Ground Use”, the short-circuit of the Varistor may not blow the current type

fuse due to the grounding resistance (between Line and Ground), which may cause flaming or burnout of the devices in the worst case.

Following safety countermeasures (A or B) are recommended;

A)Connecting a “leakage current circuit breaker” in series to the Varistor to be protected. (See Table 1)

B)Use current type fuses and a thermal type fuse which are thermally coupled each others. (See Table 1)

“ZNR” Transient/Surge Absorbers

00 Apr. 2008

– EC129 –

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Panasonic TYPE E specifications ZNR Transient/Surge Absorbors, Type E, Type CK, SC, Application Notes
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TYPE E specifications

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