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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: CHF 1.68
500In Stock

Mfr. Part No.
B72220T2381K105

Mouser Part No
871-B72220T2381K105

TDK

Varistors 385VAC 10% 20mm AdvanceD Thermofused

Datasheet

500In Stock

CHF 1.68

CHF 1.25

CHF 1.14

CHF 1.02

View

Min.: 1
Mult.: 1

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

B72230M0511M401
TDK
1: CHF 10.87
58In Stock

Mfr. Part No.
B72230M0511M401

Mouser Part No
871-B72230M0511M401

TDK

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

Datasheet

58In Stock

CHF 10.87

CHF 8.51

CHF 7.57

CHF 6.64

View

Min.: 1
Mult.: 1

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

B72220W2131K101
TDK
1: CHF 1.73
590In Stock

Mfr. Part No.
B72220W2131K101

Mouser Part No
871-B72220W2131K101

TDK

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

Datasheet

590In Stock

CHF 1.73

CHF 1.28

CHF 1.17

CHF 1.02

View

Min.: 1
Mult.: 1

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

B72230M0551M401
TDK
1: CHF 10.14
349In Stock

Mfr. Part No.
B72230M0551M401

Mouser Part No
871-B72230M0551M401

TDK

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

Datasheet

349In Stock

CHF 10.14

CHF 7.81

CHF 7.14

CHF 7.00

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

B72220R2321K101
TDK
1: CHF 1.50
794In Stock

Mfr. Part No.
B72220R2321K101

Mouser Part No
871-B72220R2321K101

TDK

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

Datasheet

794In Stock

CHF 1.50

CHF 1.11

CHF 1.01

CHF 0.881

View

Min.: 1
Mult.: 1

Varistors 510VAC 10% 20mm AdvanceD Thermofused

B72220T2511K105
TDK
1: CHF 3.13
1’534In Stock

Mfr. Part No.
B72220T2511K105

Mouser Part No
871-B72220T2511K105

TDK

Varistors 510VAC 10% 20mm AdvanceD Thermofused

Datasheet

1’534In Stock

CHF 3.13

CHF 1.97

CHF 1.81

CHF 1.54

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm AdvanceD Thermofused

B72220T2321K105
TDK
1: CHF 1.88
1’652In Stock

Mfr. Part No.
B72220T2321K105

Mouser Part No
871-B72220T2321K105

TDK

Varistors 320VAC 10% 20mm AdvanceD Thermofused

Datasheet

1’652In Stock

CHF 1.88

CHF 1.39

CHF 1.27

CHF 1.14

View

Min.: 1
Mult.: 1

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

B72230M0151M401
TDK
1: CHF 9.05
395In Stock

Mfr. Part No.
B72230M0151M401

Mouser Part No
871-B72230M0151M401

TDK

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

Datasheet

395In Stock

CHF 9.05

CHF 6.43

CHF 6.42

CHF 6.37

View

Min.: 1
Mult.: 1

Varistors 150V 14mm 2pin ThermoFuse Varistor

B72214R2151K101
TDK
1: CHF 1.35
438In Stock

Mfr. Part No.
B72214R2151K101

Mouser Part No
871-B72214R2151K101

TDK

Varistors 150V 14mm 2pin ThermoFuse Varistor

Datasheet

438In Stock

CHF 1.35

CHF 0.996

CHF 0.904

CHF 0.767

View

Min.: 1
Mult.: 1

Varistors 275V 14mm 2pin ThermoFuse Varistor

B72214R2271K101
TDK
1: CHF 1.16
532In Stock

Mfr. Part No.
B72214R2271K101

Mouser Part No
871-B72214R2271K101

TDK

Varistors 275V 14mm 2pin ThermoFuse Varistor

Datasheet

532In Stock

CHF 1.16

CHF 0.857

CHF 0.772

CHF 0.654

View

Min.: 1
Mult.: 1

Varistors 300V 14mm 2pin ThermoFuse Varistor

B72214R2301K101
TDK
1: CHF 1.16
987In Stock

Mfr. Part No.
B72214R2301K101

Mouser Part No
871-B72214R2301K101

TDK

Varistors 300V 14mm 2pin ThermoFuse Varistor

Datasheet

987In Stock

CHF 1.16

CHF 0.857

CHF 0.772

CHF 0.654

View

Min.: 1
Mult.: 1

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K105
TDK
1: CHF 1.30
385In Stock

Mfr. Part No.
B72214T2171K105

Mouser Part No
871-B72214T2171K105

TDK

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

385In Stock

CHF 1.30

CHF 0.959

CHF 0.872

CHF 0.774

View

Min.: 1
Mult.: 1

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

B72220R2301K101
TDK
1: CHF 1.43
941In Stock

Mfr. Part No.
B72220R2301K101

Mouser Part No
871-B72220R2301K101

TDK

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

Datasheet

941In Stock

CHF 1.43

CHF 1.05

CHF 0.959

CHF 0.95

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

B72220W2271K101
TDK
1: CHF 1.49
622In Stock

Mfr. Part No.
B72220W2271K101

Mouser Part No
871-B72220W2271K101

TDK

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

Datasheet

622In Stock

CHF 1.49

CHF 1.11

CHF 1.00

CHF 0.996

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 2-pin ThermoFuse

B72220R2271K101
TDK
1: CHF 1.60
740Expected 9/7/2026

Mfr. Part No.
B72220R2271K101

Mouser Part No
871-B72220R2271K101

TDK

Varistors 275VAC 10% 20mm 2-pin ThermoFuse

Datasheet

740Expected 9/7/2026

CHF 1.60

CHF 1.18

CHF 1.07

CHF 0.931

View

Min.: 1
Mult.: 1

Varistors 320V 14mm 2pin ThermoFuse Varistor

B72214R2321K101
TDK
1: CHF 1.16
Lead-Time 10 Weeks

Mfr. Part No.
B72214R2321K101

Mouser Part No
871-B72214R2321K101

TDK

Varistors 320V 14mm 2pin ThermoFuse Varistor

Datasheet

Lead-Time 10 Weeks

CHF 1.16

CHF 0.857

CHF 0.772

CHF 0.654

View

Min.: 1
Mult.: 1

Varistors 150VAC 10% 14mm AdvanceD Thermofused

B72214T2151K105
TDK
1’960: CHF 0.841
Non-Stocked Lead-Time 8 Weeks

Mfr. Part No.
B72214T2151K105

Mouser Part No
871-B72214T2151K105

TDK

Varistors 150VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

CHF 0.841

Min.: 1’960
Mult.: 1’960

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K106
TDK
1’960: CHF 0.706
Non-Stocked Lead-Time 8 Weeks

Mfr. Part No.
B72214T2171K106

Mouser Part No
871-B72214T2171K106

TDK

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

CHF 0.706

Min.: 1’960
Mult.: 1’960

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K106
TDK
1’960: CHF 0.706
Non-Stocked Lead-Time 8 Weeks

Mfr. Part No.
B72214T2301K106

Mouser Part No
871-B72214T2301K106

TDK

Varistors 300VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

CHF 0.706

Min.: 1’960
Mult.: 1’960

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K108
TDK
1’680: CHF 0.706
Non-Stocked Lead-Time 8 Weeks

Mfr. Part No.
B72214T2301K108

Mouser Part No
871-B72214T2301K108

TDK

Varistors 300VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

CHF 0.706

Min.: 1’680
Mult.: 1’680

Varistors 320VAC 10% 14mm AdvanceD Thermofused

B72214T2321K106
TDK
1’960: CHF 0.539
Non-Stocked Lead-Time 8 Weeks

Mfr. Part No.
B72214T2321K106

Mouser Part No
871-B72214T2321K106

TDK

Varistors 320VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 8 Weeks

CHF 0.539

Min.: 1’960
Mult.: 1’960

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

B72214W2321K101
TDK
1: CHF 1.22
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
B72214W2321K101

Mouser Part No
871-B72214W2321K101

TDK

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

CHF 1.22

CHF 0.896

CHF 0.817

CHF 0.687

View

Min.: 1
Mult.: 1

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

B72214W2381K101
TDK
1’000: CHF 0.655
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
B72214W2381K101

Mouser Part No
871-B72214W2381K101

TDK

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

CHF 0.655

CHF 0.596

Min.: 1’000
Mult.: 1’000

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

B72220R2131K101
TDK
750: CHF 0.931
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
B72220R2131K101

Mouser Part No
871-B72220R2131K101

TDK

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

CHF 0.931

CHF 0.844

Min.: 750
Mult.: 750

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

B72220R2151K101
TDK
750: CHF 0.931
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
B72220R2151K101

Mouser Part No
871-B72220R2151K101

TDK

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 10 Weeks

CHF 0.931

CHF 0.844

Min.: 750
Mult.: 750