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Metal Oxide Varistors

Metal Oxide Varistor
Specifications:

Response Time

<50ns

Voltage Coefficient

-0.05%/ºC
Insulation Resistance ≥1000MΩ @500V
Insulation Voltage 1000Vrms (Varistor Rating ≤330V

1500Vrms (Varistor Rating ≥330V

Operating Temperature Range

-40ºC to 85ºC

 

 
These devices are designed to protect equipment against transient voltage spikes. Connected directly across the supply rails, they offer a simple solution to transient suppression. A varistor remains high impedance during normal use, when a spike is encountered the impedance drops to a very low level, clamping the transient voltage to an acceptable level. The varistor absorbs the unwanted energy thereby protecting the equipment.

Operating

Voltage

Vrms

Vdc

Varistor Voltage

Nominal

Min/Max

Max Clamp Voltage

Current

Surge Current

1 Surge

2 Surge

Power

W

Energy j

10/1000µs

Dia

mm
11 14 18 16/20 36 2.5A 250 125 0.02 0.9 7.0
14 18 22 20/24 43 2.5A 250 125 0.02 1.1 7.0
17 22 27 24/30 53 2.5A 250 125 0.02 1.4 7.0
20 26 33 30/36 65 2.5A 250 125 0.02 1.7 7.0
30 38 47 42/52 93 2.5A 250 125 0.02 2.5 7.0
50 65 82 74/90 135 10 1200 600 0.25 5.5 7.0
60 85 100 90/110 165 10 1200 600 0.25 6.5 7.0
75 100 120 108/132 200 10 1200 600 0.25 7.8 7.0
130 170 200 185/225 340 10 1200 600 0.25 13 7.0
130 170 200 185/225 340 50 4500 2500 0.6 57 14.0
150 200 240 216/264 395 10 1200 600 0.25 15 7.0
150 200 240 216/264 395 25 2500 1250 0.4 35 10.0
150 200 240 216/264 395 100 6500 4000 1 108 20.0
175 225 270 247/303 455 10 1200 600 0.25 18 7.0
250 320 390 351/429 650 10 1200 600 0.25 25 7.0
250 320 390 351/429 650 25 2500 1250 0.4 60 10.0
250 320 390 351/429 650 50 4500 2500 0.6 100 14.0
275 350 430 387/473 710 10 1200 600 0.25 28 7.0
275 350 430 387/473 710 25 2500 1250 0.4 65 10.0
275 350 430 387/473 710 50 4500 2500 0.6 115 14.0
275 350 430 387/473 710 100 6500 4000 1 190 20.0
300 385 470 423/517 775 10 1200 600 0.25 30 7.0

Order Code   1 25+ 50+ 100+
741-180 Operating Voltage 11V @2.5A 0.22 0.1835 0.1468 0.1174
741-220 Operating Voltage 14V @2.5A 0.14 0.1195 0.0956 0.086
741-270 Operating Voltage 17V @2.5A 0.13 0.1124 0.0963 0.0642
741-330 Operating Voltage 20V @2.5A 0.13 0.1124 0.0963 0.0642
741-470 Operating Voltage 30V @2.5A 0.13 0.1124 0.0963 0.0642
741-820 Operating Voltage 50V @10A 0.08 0.0735 0.063 0.042
741-101 Operating Voltage 60V @10A 0.10 0.084 0.072 0.048
741-121 Operating Voltage 75V @10A 0.08 0.0735 0.063 0.042
741-201 Operating Voltage 130V @10A 0.08 0.0735 0.063 0.042
743-201 Operating Voltage 130V @50A 0.20 0.1729 0.1482 0.0988
741-241 Operating Voltage 150V @10A 0.08 0.714 0.0612 0.0408
742-241 Operating Voltage 150V @25A 0.12 0.1082 0.0927 0.0618
744-241 Operating Voltage 150V @100A 0.43 0.3805 0.3261 0.2174
741-271 Operating Voltage 175V @10A 0.08 0.0714 0.0612 0.0408
741-391 Operating Voltage 250V @10A 0.08 0.0679 0.0582 0.0388
742-391 Operating Voltage 250V @25A 0.13 0.1124 0.0963 0.0642
743-391 Operating Voltage 250V @50A 0.19 0.1735 0.1542 0.135
741-431 Operating Voltage 275V @10A 0.09 0.0756 0.0648 0.0432
742-431 Operating Voltage 275V @25A 0.14 0.119 0.102 0.068
743-431 Operating Voltage 275V @50A 0.20 0.1584 0.1188 0.0792
744-431 Operating Voltage 275V @100A 0.81 0.6705 0.5364 0.4291
741-471 Operating Voltage 300V @10A 0.09 0.0816 0.0699 0.0466

 

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Tel: 0191 251 4363

  
 

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