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■ Do not wash the surge absorber with a solvent (thinner, acetone, etc.) that damages the outer sheath resin.
Response to anomalies and handling conditions
Be careful not to drop the surge absorber on the floor, etc. The product is likely to suffer mechanical or electrical damage
when dropped on the floor. Avoid using such a product.
Reliability and product life
To know the detailed specifications of individual products or specific evaluation test scores, please contact us.
Circuit design and circuit board design
Meet the following requirements. Not following the requirements can result in a shorter lifespan of the surge absorber or its
failure.
■ Choose a surge absorber whose maximum allowable circuit voltage has a margin relative to the maximum voltage range
including source voltage fluctuations.
* See Table 1 in the "Circuit design and circuit board design" section.
■ When surges are applied intermittently to the surge absorber at short intervals (when pulses of voltages are applied in a
noise simulator test, etc.), make sure that the surge power does not exceed the maximum average pulse power of the surge
absorber.
■ The product numbers of recommended surge absorbers to choose are shown in Table 1.
(1) The case of placing the surge absorber between lines
When the source voltage is expected to rise temporarily due to unbalanced single-wire loads in a three-phase three-wire
connection configuration, a short circuit between a voltage line and a neutral line, loss of the neutral line, or resonance of
a capacitive load caused by switching on/off, use a surge absorber (varistor) indicated by "*" in Table 1.
(2) The case of placing the surge absorber between a line and the ground
Line-to-ground voltage may rise with a single-wire ground fault, etc. Use a recommended surge absorber in Table 1
that is different from the surge absorber placed between lines. When the device is subjected to an insulation resistance
test (500 V DC), use a surge absorber indicated by "**" in Table 1.
According to "Electrical Appliance Technical Standards" based on the Electrical Appliance and Material Safety Act, when
using a varistor voltage which would fail the insulation performance test, the surge absorber may be removed from the
device when being subjected to the test, depending on circuit test conditions.
* See attached table 4, appendix 4, "Electrical Appliance Technical Standards" based on the Electrical Appliance and
Material Safety Act.
When conducting a withstand voltage test (1000 V AC) of the device, remove the surge absorber from the device
after getting approval from the parties concerned.
■ Current fuse
(1) Select a surge absorber and fuses to use in as shown in the following table.
Confirm that no secondary accident arises when the surge absorber in an actual circuit breaks. Selected rated currents of
current fuses shown in the following table are exemplary one and may vary depending on circuit conditions used. Confirm
the rated current by a test, etc., before using the current fuse.
Series
Current fuse
(placed between lines)
Temperature fuse
(placed between a line and the
ground)
* Use the rated voltage of the current fuse that corresponds to the circuit voltage of a circuit including the current fuse.
* Connect a temperature fuse directly to the terminal so that heat from the terminal is easily transferred to the fuse and that the
fusing element of the fuse extends along its sides.
(2) Recommended parts where fuses are connected are shown in Table 1. When a load current to a protected device is so
large as to exceed the rated current of the fuse, however, connect the fuse in a location shown in the following diagram.
Power supply
ERZC
20EK□□□(□)
32EK□□□(□)
10 A max.
20 A max.
100 to 120℃ 5A
100 to 120℃ 10A
Matters to Be Observed When Using This Product
ERZC
ERZV
S34C□□□
20 A max.
100 to 120℃ 10A
Current fuse
Protected
device
ZNR
ERZC
□□CK□□□W
20 A max.
100 to 120℃ 10A
30-Jun-23
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