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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 #

Varistors 385VAC 10% 20mm AdvanceD Thermofused

B72220T2381K105
TDK
1: $2.230
500In Stock

Mfr. Part #
B72220T2381K105

Mouser Part #
871-B72220T2381K105

TDK

Varistors 385VAC 10% 20mm AdvanceD Thermofused

Datasheet

500In Stock

$2.230

$1.662

$1.514

$1.357

View

Min.: 1
Mult.: 1

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

B72230M0511M401
TDK
1: $14.419
58In Stock

Mfr. Part #
B72230M0511M401

Mouser Part #
871-B72230M0511M401

TDK

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

Datasheet

58In Stock

$14.419

$11.285

$10.044

$8.803

View

Min.: 1
Mult.: 1

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

B72220W2131K101
TDK
1: $2.303
590In Stock

Mfr. Part #
B72220W2131K101

Mouser Part #
871-B72220W2131K101

TDK

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

Datasheet

590In Stock

$2.303

$1.704

$1.557

$1.357

View

Min.: 1
Mult.: 1

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

B72230M0551M401
TDK
1: $12.200
349In Stock

Mfr. Part #
B72230M0551M401

Mouser Part #
871-B72230M0551M401

TDK

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

Datasheet

349In Stock

$12.200

$9.549

$8.519

$7.919

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

B72220R2321K101
TDK
1: $1.998
794In Stock

Mfr. Part #
B72220R2321K101

Mouser Part #
871-B72220R2321K101

TDK

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

Datasheet

794In Stock

$1.998

$1.472

$1.346

$1.167

View

Min.: 1
Mult.: 1

Varistors 510VAC 10% 20mm AdvanceD Thermofused

B72220T2511K105
TDK
1: $4.144
1.534In Stock

Mfr. Part #
B72220T2511K105

Mouser Part #
871-B72220T2511K105

TDK

Varistors 510VAC 10% 20mm AdvanceD Thermofused

Datasheet

1.534In Stock

$4.144

$2.619

$2.398

$2.040

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm AdvanceD Thermofused

B72220T2321K105
TDK
1: $2.493
1.652In Stock

Mfr. Part #
B72220T2321K105

Mouser Part #
871-B72220T2321K105

TDK

Varistors 320VAC 10% 20mm AdvanceD Thermofused

Datasheet

1.652In Stock

$2.493

$1.851

$1.683

$1.514

View

Min.: 1
Mult.: 1

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

B72230M0151M401
TDK
1: $12.010
395In Stock

Mfr. Part #
B72230M0151M401

Mouser Part #
871-B72230M0151M401

TDK

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

Datasheet

395In Stock

$12.010

$8.519

$8.508

$8.445

View

Min.: 1
Mult.: 1

Varistors 150V 14mm 2pin ThermoFuse Varistor

B72214R2151K101
TDK
1: $1.788
438In Stock

Mfr. Part #
B72214R2151K101

Mouser Part #
871-B72214R2151K101

TDK

Varistors 150V 14mm 2pin ThermoFuse Varistor

Datasheet

438In Stock

$1.788

$1.315

$1.199

$1.017

View

Min.: 1
Mult.: 1

Varistors 275V 14mm 2pin ThermoFuse Varistor

B72214R2271K101
TDK
1: $1.546
532In Stock

Mfr. Part #
B72214R2271K101

Mouser Part #
871-B72214R2271K101

TDK

Varistors 275V 14mm 2pin ThermoFuse Varistor

Datasheet

532In Stock

$1.546

$1.136

$1.023

$867

View

Min.: 1
Mult.: 1

Varistors 300V 14mm 2pin ThermoFuse Varistor

B72214R2301K101
TDK
1: $1.546
987In Stock

Mfr. Part #
B72214R2301K101

Mouser Part #
871-B72214R2301K101

TDK

Varistors 300V 14mm 2pin ThermoFuse Varistor

Datasheet

987In Stock

$1.546

$1.136

$1.023

$867

View

Min.: 1
Mult.: 1

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K105
TDK
1: $1.725
385In Stock

Mfr. Part #
B72214T2171K105

Mouser Part #
871-B72214T2171K105

TDK

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

385In Stock

$1.725

$1.273

$1.157

$1.026

View

Min.: 1
Mult.: 1

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

B72220R2301K101
TDK
1: $1.893
941In Stock

Mfr. Part #
B72220R2301K101

Mouser Part #
871-B72220R2301K101

TDK

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

Datasheet

941In Stock

$1.893

$1.399

$1.273

$1.262

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

B72220W2271K101
TDK
1: $1.977
622In Stock

Mfr. Part #
B72220W2271K101

Mouser Part #
871-B72220W2271K101

TDK

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

Datasheet

622In Stock

$1.977

$1.462

$1.336

$1.325

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 2-pin ThermoFuse

B72220R2271K101
TDK
1: $2.114
740Expected 9/7/2026

Mfr. Part #
B72220R2271K101

Mouser Part #
871-B72220R2271K101

TDK

Varistors 275VAC 10% 20mm 2-pin ThermoFuse

Datasheet

740Expected 9/7/2026

$2.114

$1.567

$1.420

$1.230

View

Min.: 1
Mult.: 1

Varistors 320V 14mm 2pin ThermoFuse Varistor

B72214R2321K101
TDK
1: $1.546
Lead-Time 10 Weeks

Mfr. Part #
B72214R2321K101

Mouser Part #
871-B72214R2321K101

TDK

Varistors 320V 14mm 2pin ThermoFuse Varistor

Datasheet

Lead-Time 10 Weeks

$1.546

$1.136

$1.023

$867

View

Min.: 1
Mult.: 1

Varistors 150VAC 10% 14mm AdvanceD Thermofused

B72214T2151K105
TDK
1.960: $1.115
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2151K105

Mouser Part #
871-B72214T2151K105

TDK

Varistors 150VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$1.115

Min.: 1.960
Mult.: 1.960

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K106
TDK
1.960: $937
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2171K106

Mouser Part #
871-B72214T2171K106

TDK

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$937

Min.: 1.960
Mult.: 1.960

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K106
TDK
1.960: $937
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2301K106

Mouser Part #
871-B72214T2301K106

TDK

Varistors 300VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$937

Min.: 1.960
Mult.: 1.960

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K108
TDK
1.680: $937
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2301K108

Mouser Part #
871-B72214T2301K108

TDK

Varistors 300VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$937

Min.: 1.680
Mult.: 1.680

Varistors 320VAC 10% 14mm AdvanceD Thermofused

B72214T2321K106
TDK
1.960: $715
Non-Stocked Lead-Time 8 Weeks

Mfr. Part #
B72214T2321K106

Mouser Part #
871-B72214T2321K106

TDK

Varistors 320VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

$715

Min.: 1.960
Mult.: 1.960

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

B72214W2321K101
TDK
1: $1.620
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72214W2321K101

Mouser Part #
871-B72214W2321K101

TDK

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$1.620

$1.188

$1.083

$911

View

Min.: 1
Mult.: 1

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

B72214W2381K101
TDK
1.000: $869
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72214W2381K101

Mouser Part #
871-B72214W2381K101

TDK

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$869

$788

Min.: 1.000
Mult.: 1.000

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

B72220R2131K101
TDK
750: $1.230
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72220R2131K101

Mouser Part #
871-B72220R2131K101

TDK

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$1.230

$1.115

Min.: 750
Mult.: 750

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

B72220R2151K101
TDK
750: $1.230
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
B72220R2151K101

Mouser Part #
871-B72220R2151K101

TDK

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

$1.230

$1.115

Min.: 750
Mult.: 750