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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 320VAC 10% 20mm 2-pin ThermoFuse

B72220R2321K101
TDK
1: $1.90
794In Stock

Mfr. Part No.
B72220R2321K101

Mouser Part No
871-B72220R2321K101

TDK

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

Datasheet

794In Stock

$1.90

$1.40

$1.28

$1.11

View

Min.: 1
Mult.: 1

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

B72220W2131K101
TDK
1: $2.19
590In Stock

Mfr. Part No.
B72220W2131K101

Mouser Part No
871-B72220W2131K101

TDK

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

Datasheet

590In Stock

$2.19

$1.62

$1.48

$1.29

View

Min.: 1
Mult.: 1

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

B72230M0551M401
TDK
1: $11.47
349In Stock

Mfr. Part No.
B72230M0551M401

Mouser Part No
871-B72230M0551M401

TDK

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

Datasheet

349In Stock

$11.47

$9.00

$8.01

$7.40

View

Min.: 1
Mult.: 1

Varistors 510VAC 10% 20mm AdvanceD Thermofused

B72220T2511K105
TDK
1: $2.42
1,537In Stock

Mfr. Part No.
B72220T2511K105

Mouser Part No
871-B72220T2511K105

TDK

Varistors 510VAC 10% 20mm AdvanceD Thermofused

Datasheet

1,537In Stock

$2.42

$1.69

$1.63

$1.51

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm AdvanceD Thermofused

B72220T2321K105
TDK
1: $2.55
1,655In Stock

Mfr. Part No.
B72220T2321K105

Mouser Part No
871-B72220T2321K105

TDK

Varistors 320VAC 10% 20mm AdvanceD Thermofused

Datasheet

1,655In Stock

$2.55

$1.90

$1.72

$1.54

View

Min.: 1
Mult.: 1

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

B72230M0151M401
TDK
1: $11.42
395In Stock

Mfr. Part No.
B72230M0151M401

Mouser Part No
871-B72230M0151M401

TDK

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

Datasheet

395In Stock

$11.42

$8.11

$8.09

$8.04

View

Min.: 1
Mult.: 1

Varistors 150V 14mm 2pin ThermoFuse Varistor

B72214R2151K101
TDK
1: $1.70
638In Stock

Mfr. Part No.
B72214R2151K101

Mouser Part No
871-B72214R2151K101

TDK

Varistors 150V 14mm 2pin ThermoFuse Varistor

Datasheet

638In Stock

$1.70

$1.26

$1.14

$1.05

View

Min.: 1
Mult.: 1

Varistors 275V 14mm 2pin ThermoFuse Varistor

B72214R2271K101
TDK
1: $1.47
532In Stock

Mfr. Part No.
B72214R2271K101

Mouser Part No
871-B72214R2271K101

TDK

Varistors 275V 14mm 2pin ThermoFuse Varistor

Datasheet

532In Stock

$1.47

$1.08

$0.973

$0.891

View

Min.: 1
Mult.: 1

Varistors 300V 14mm 2pin ThermoFuse Varistor

B72214R2301K101
TDK
1: $1.47
187In Stock
800Expected 2026/06/19

Mfr. Part No.
B72214R2301K101

Mouser Part No
871-B72214R2301K101

TDK

Varistors 300V 14mm 2pin ThermoFuse Varistor

Datasheet

187In Stock

800Expected 2026/06/19

$1.47

$1.08

$0.973

$0.968

View

Min.: 1
Mult.: 1

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K105
TDK
1: $1.64
385In Stock

Mfr. Part No.
B72214T2171K105

Mouser Part No
871-B72214T2171K105

TDK

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

385In Stock

$1.64

$1.21

$1.10

$0.961

View

Min.: 1
Mult.: 1

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

B72220R2301K101
TDK
1: $1.80
941In Stock

Mfr. Part No.
B72220R2301K101

Mouser Part No
871-B72220R2301K101

TDK

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

Datasheet

941In Stock

$1.80

$1.33

$1.21

$1.13

View

Min.: 1
Mult.: 1

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

B72230M0511M401
TDK
1: $13.71
58In Stock

Mfr. Part No.
B72230M0511M401

Mouser Part No
871-B72230M0511M401

TDK

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

Datasheet

58In Stock

$13.71

$10.75

$9.55

$8.36

View

Min.: 1
Mult.: 1

Varistors 385VAC 10% 20mm AdvanceD Thermofused

B72220T2381K105
TDK
1: $2.12
500Expected 2026/07/03

Mfr. Part No.
B72220T2381K105

Mouser Part No
871-B72220T2381K105

TDK

Varistors 385VAC 10% 20mm AdvanceD Thermofused

Datasheet

500Expected 2026/07/03

$2.12

$1.58

$1.44

$1.29

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

B72220W2271K101
TDK
1: $1.88
632Expected 2026/07/30

Mfr. Part No.
B72220W2271K101

Mouser Part No
871-B72220W2271K101

TDK

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

Datasheet

632Expected 2026/07/30

$1.88

$1.40

$1.27

$1.10

View

Min.: 1
Mult.: 1

Varistors 320V 14mm 2pin ThermoFuse Varistor

B72214R2321K101
TDK
1: $1.47
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

$1.47

$1.08

$0.973

$0.942

View

Min.: 1
Mult.: 1

Varistors 150VAC 10% 14mm AdvanceD Thermofused

B72214T2151K105
TDK
1,960: $1.06
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

$1.06

Min.: 1,960
Mult.: 1,960

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K106
TDK
1,960: $0.891
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

$0.891

Min.: 1,960
Mult.: 1,960

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K106
TDK
1,960: $0.891
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

$0.891

Min.: 1,960
Mult.: 1,960

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K108
TDK
1,680: $0.913
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

$0.913

$0.891

Min.: 1,680
Mult.: 1,680

Varistors 320VAC 10% 14mm AdvanceD Thermofused

B72214T2321K106
TDK
1,960: $0.68
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

$0.68

Min.: 1,960
Mult.: 1,960

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

B72214W2321K101
TDK
1: $1.54
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

$1.54

$1.13

$1.03

$0.83

View

Min.: 1
Mult.: 1

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

B72214W2381K101
TDK
1,000: $0.826
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

$0.826

$0.751

Min.: 1,000
Mult.: 1,000

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

B72220R2131K101
TDK
750: $1.17
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

$1.17

$1.06

Min.: 750
Mult.: 750

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

B72220R2151K101
TDK
750: $1.17
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

$1.17

$1.06

Min.: 750
Mult.: 750

Varistors 250VAC 10% 20mm 2-pin ThermoFuse

B72220R2251K101
TDK
1: $1.80
Lead-Time 10 Weeks

Mfr. Part No.
B72220R2251K101

Mouser Part No
871-B72220R2251K101

TDK

Varistors 250VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Lead-Time 10 Weeks

$1.80

$1.33

$1.21

$1.05

View

Min.: 1
Mult.: 1