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ThermoFuse™ Varistors

TDK ThermoFuse™ Varistors feature a wide operating voltage range of 130V_RMS to 750V_RMS. These varistors are self-protected under abnormal overvoltage conditions and offer high-energy Advanced series E2. TDK ThermoFuse varistors include either leaded square varistor elements or leaded round varistor elements. These varistors are made of epoxy molding and are flame-retardant as per UL 94 V-0. The ThermoFuse varistors come with tinned copper wire and metal compound wire terminals. Typical applications include power meters, telecom, transient voltage surger suppressors (TVSS), and household appliances.

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Part #

Industrial Surge Protectors 550V 25kA 10% 4pin 30mm

B72230M0551M401
EPCOS / TDK
1: $ 51.502
349In Stock

Mfr. Part #
B72230M0551M401

Mouser Part #
871-B72230M0551M401

Industrial Surge Protectors 550V 25kA 10% 4pin 30mm

Datasheet

349In Stock

$ 51.502

$ 39.649

$ 36.148

$ 35.473

View

Min.: 1
Mult.: 1

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

B72220R2301K101
EPCOS / TDK
1: $ 5.146
1.748In Stock

Mfr. Part #
B72220R2301K101

Mouser Part #
871-B72220R2301K101

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

Datasheet

1.748In Stock

$ 5.146

$ 4.345

$ 4.129

$ 3.843

View

Min.: 1
Mult.: 1

Industrial Surge Protectors 150V 25kA 10% 4pin 30mm

B72230M0151M401
EPCOS / TDK
1: $ 46.103
495In Stock

Mfr. Part #
B72230M0151M401

Mouser Part #
871-B72230M0151M401

Industrial Surge Protectors 150V 25kA 10% 4pin 30mm

Datasheet

495In Stock

$ 46.103

$ 36.064

$ 32.521

$ 30.580

View

Min.: 1
Mult.: 1

Industrial Surge Protectors 510V 25kA 10% 4pin 30mm

B72230M0511M401
EPCOS / TDK
1: $ 55.340
58In Stock

Mfr. Part #
B72230M0511M401

Mouser Part #
871-B72230M0511M401

Industrial Surge Protectors 510V 25kA 10% 4pin 30mm

Datasheet

58In Stock

$ 55.340

$ 43.150

$ 38.342

$ 29.568

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

B72220R2321K101
EPCOS / TDK
1: $ 7.002
794In Stock

Mfr. Part #
B72220R2321K101

Mouser Part #
871-B72220R2321K101

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

Datasheet

794In Stock

$ 7.002

$ 5.146

$ 4.682

$ 4.041

View

Min.: 1
Mult.: 1

Varistors 150V 14mm 2pin ThermoFuse Varistor

B72214R2151K101
EPCOS / TDK
1: $ 4.429
1.058In Stock

Mfr. Part #
B72214R2151K101

Mouser Part #
871-B72214R2151K101

Varistors 150V 14mm 2pin ThermoFuse Varistor

Datasheet

1.058In Stock

$ 4.429

$ 3.615

$ 3.412

$ 3.273

View

Min.: 1
Mult.: 1

Varistors 510VAC 10% 20mm AdvanceD Thermofused

B72220T2511K105
EPCOS / TDK
1: $ 10.208
1.539In Stock

Mfr. Part #
B72220T2511K105

Mouser Part #
871-B72220T2511K105

Varistors 510VAC 10% 20mm AdvanceD Thermofused

Datasheet

1.539In Stock

$ 10.208

$ 7.128

$ 6.875

$ 6.369

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm AdvanceD Thermofused

B72220T2321K105
EPCOS / TDK
1: $ 8.225
2.355In Stock

Mfr. Part #
B72220T2321K105

Mouser Part #
871-B72220T2321K105

Varistors 320VAC 10% 20mm AdvanceD Thermofused

Datasheet

2.355In Stock

$ 8.225

$ 6.074

$ 5.568

$ 4.977

View

Min.: 1
Mult.: 1

Varistors 275V 14mm 2pin ThermoFuse Varistor

B72214R2271K101
EPCOS / TDK
1: $ 5.694
1.032In Stock

Mfr. Part #
B72214R2271K101

Mouser Part #
871-B72214R2271K101

Varistors 275V 14mm 2pin ThermoFuse Varistor

Datasheet

1.032In Stock

$ 5.694

$ 4.142

$ 3.758

$ 3.176

View

Min.: 1
Mult.: 1

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K105
EPCOS / TDK
1: $ 6.369
489In Stock

Mfr. Part #
B72214T2171K105

Mouser Part #
871-B72214T2171K105

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

489In Stock

$ 6.369

$ 4.682

$ 4.260

$ 3.699

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

B72220W2271K101
EPCOS / TDK
1: $ 7.297
239In Stock

Mfr. Part #
B72220W2271K101

Mouser Part #
871-B72220W2271K101

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

Datasheet

239In Stock

$ 7.297

$ 5.399

$ 4.893

$ 4.260

View

Min.: 1
Mult.: 1

Varistors 300V 14mm 2pin ThermoFuse Varistor

B72214R2301K101
EPCOS / TDK
1: $ 5.694
987Expected 4/13/2026

Mfr. Part #
B72214R2301K101

Mouser Part #
871-B72214R2301K101

Varistors 300V 14mm 2pin ThermoFuse Varistor

Datasheet

987Expected 4/13/2026

$ 5.694

$ 4.142

$ 3.758

$ 3.176

View

Min.: 1
Mult.: 1

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

B72220W2131K101
EPCOS / TDK
1: $ 7.297
600Expected 2/23/2026

Mfr. Part #
B72220W2131K101

Mouser Part #
871-B72220W2131K101

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

Datasheet

600Expected 2/23/2026

$ 7.297

$ 5.399

$ 4.893

$ 4.260

View

Min.: 1
Mult.: 1

Varistors 320V 14mm 2pin ThermoFuse Varistor

B72214R2321K101
EPCOS / TDK
1: $ 5.694
Lead-Time 10 Weeks

Mfr. Part #
B72214R2321K101

Mouser Part #
871-B72214R2321K101

Varistors 320V 14mm 2pin ThermoFuse Varistor

Datasheet

Lead-Time 10 Weeks

$ 5.694

$ 4.142

$ 3.758

$ 3.176

View

Min.: 1
Mult.: 1

Varistors 150VAC 10% 14mm AdvanceD Thermofused

B72214T2151K105
EPCOS / TDK
1.960: $ 3.509
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2151K105

Mouser Part #
871-B72214T2151K105

Varistors 150VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$ 3.509

$ 3.261

$ 3.138

Min.: 1.960
Mult.: 980

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K106
EPCOS / TDK
1.960: $ 3.197
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2171K106

Mouser Part #
871-B72214T2171K106

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$ 3.197

Min.: 1.960
Mult.: 980

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K106
EPCOS / TDK
1.960: $ 3.197
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2301K106

Mouser Part #
871-B72214T2301K106

Varistors 300VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$ 3.197

Min.: 1.960
Mult.: 980

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K108
EPCOS / TDK
1.680: $ 3.218
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2301K108

Mouser Part #
871-B72214T2301K108

Varistors 300VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$ 3.218

$ 3.201

Min.: 1.680
Mult.: 560

Varistors 320VAC 10% 14mm AdvanceD Thermofused

B72214T2321K106
EPCOS / TDK
1.960: $ 2.459
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2321K106

Mouser Part #
871-B72214T2321K106

Varistors 320VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$ 2.459

$ 2.451

Min.: 1.960
Mult.: 980

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

B72214W2321K101
EPCOS / TDK
1.000: $ 3.054
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72214W2321K101

Mouser Part #
871-B72214W2321K101

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$ 3.054

$ 2.940

$ 2.877

Min.: 1.000
Mult.: 200

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

B72214W2381K101
EPCOS / TDK
1.000: $ 3.054
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72214W2381K101

Mouser Part #
871-B72214W2381K101

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$ 3.054

$ 2.940

$ 2.877

Min.: 1.000
Mult.: 200

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

B72220R2131K101
EPCOS / TDK
1: $ 7.002
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72220R2131K101

Mouser Part #
871-B72220R2131K101

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$ 7.002

$ 5.146

$ 4.682

$ 4.041

View

Min.: 1
Mult.: 1

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

B72220R2151K101
EPCOS / TDK
1: $ 7.002
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72220R2151K101

Mouser Part #
871-B72220R2151K101

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$ 7.002

$ 5.146

$ 4.682

$ 4.041

View

Min.: 1
Mult.: 1

Varistors 250VAC 10% 20mm 2-pin ThermoFuse

B72220R2251K101
EPCOS / TDK
1: $ 7.002
Lead-Time 10 Weeks

Mfr. Part #
B72220R2251K101

Mouser Part #
871-B72220R2251K101

Varistors 250VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Lead-Time 10 Weeks

$ 7.002

$ 5.146

$ 4.682

$ 4.041

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 2-pin ThermoFuse

B72220R2271K101
EPCOS / TDK
1: $ 7.002
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72220R2271K101

Mouser Part #
871-B72220R2271K101

Varistors 275VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$ 7.002

$ 5.146

$ 4.682

$ 4.041

View

Min.: 1
Mult.: 1