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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: $17.44
349In Stock

Mfr. Part #
B72230M0551M401

Mouser Part #
871-B72230M0551M401

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

Datasheet

349In Stock

$17.44

$13.61

$12.07

$11.08

View

Min.: 1
Mult.: 1

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

B72230M0151M401
EPCOS / TDK
1: $16.94
495In Stock

Mfr. Part #
B72230M0151M401

Mouser Part #
871-B72230M0151M401

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

Datasheet

495In Stock

$16.94

$13.25

$11.95

$11.24

View

Min.: 1
Mult.: 1

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

B72220R2301K101
EPCOS / TDK
1: $1.89
1,748In Stock

Mfr. Part #
B72220R2301K101

Mouser Part #
871-B72220R2301K101

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

Datasheet

1,748In Stock

$1.89

$1.60

$1.52

$1.41

View

Min.: 1
Mult.: 1

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

B72230M0511M401
EPCOS / TDK
1: $20.89
58In Stock

Mfr. Part #
B72230M0511M401

Mouser Part #
871-B72230M0511M401

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

Datasheet

58In Stock

$20.89

$15.84

$14.09

$12.69

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

B72220R2321K101
EPCOS / TDK
1: $1.94
794In Stock

Mfr. Part #
B72220R2321K101

Mouser Part #
871-B72220R2321K101

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

Datasheet

794In Stock

$1.94

$1.63

$1.57

$1.45

View

Min.: 1
Mult.: 1

Varistors 150V 14mm 2pin ThermoFuse Varistor

B72214R2151K101
EPCOS / TDK
1: $1.75
1,058In Stock

Mfr. Part #
B72214R2151K101

Mouser Part #
871-B72214R2151K101

Varistors 150V 14mm 2pin ThermoFuse Varistor

Datasheet

1,058In Stock

$1.75

$1.38

$1.29

$1.20

View

Min.: 1
Mult.: 1

Varistors 510VAC 10% 20mm AdvanceD Thermofused

B72220T2511K105
EPCOS / TDK
1: $3.75
1,539In Stock

Mfr. Part #
B72220T2511K105

Mouser Part #
871-B72220T2511K105

Varistors 510VAC 10% 20mm AdvanceD Thermofused

Datasheet

1,539In Stock

$3.75

$2.62

$2.53

$2.34

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm AdvanceD Thermofused

B72220T2321K105
EPCOS / TDK
1: $3.02
2,355In Stock

Mfr. Part #
B72220T2321K105

Mouser Part #
871-B72220T2321K105

Varistors 320VAC 10% 20mm AdvanceD Thermofused

Datasheet

2,355In Stock

$3.02

$2.23

$2.05

$1.83

View

Min.: 1
Mult.: 1

Varistors 275V 14mm 2pin ThermoFuse Varistor

B72214R2271K101
EPCOS / TDK
1: $2.09
1,032In Stock

Mfr. Part #
B72214R2271K101

Mouser Part #
871-B72214R2271K101

Varistors 275V 14mm 2pin ThermoFuse Varistor

Datasheet

1,032In Stock

$2.09

$1.52

$1.38

$1.17

View

Min.: 1
Mult.: 1

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K105
EPCOS / TDK
1: $2.34
489In Stock

Mfr. Part #
B72214T2171K105

Mouser Part #
871-B72214T2171K105

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

489In Stock

$2.34

$1.72

$1.57

$1.36

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

B72220W2271K101
EPCOS / TDK
1: $2.68
244In Stock

Mfr. Part #
B72220W2271K101

Mouser Part #
871-B72220W2271K101

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

Datasheet

244In Stock

$2.68

$1.98

$1.80

$1.57

View

Min.: 1
Mult.: 1

Varistors 300V 14mm 2pin ThermoFuse Varistor

B72214R2301K101
EPCOS / TDK
1: $2.51
987Expected 2026-04-13

Mfr. Part #
B72214R2301K101

Mouser Part #
871-B72214R2301K101

Varistors 300V 14mm 2pin ThermoFuse Varistor

Datasheet

987Expected 2026-04-13

$2.51

$1.83

$1.66

$1.40

View

Min.: 1
Mult.: 1

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

B72220W2131K101
EPCOS / TDK
1: $2.68
600Expected 2026-02-23

Mfr. Part #
B72220W2131K101

Mouser Part #
871-B72220W2131K101

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

Datasheet

600Expected 2026-02-23

$2.68

$1.98

$1.80

$1.57

View

Min.: 1
Mult.: 1

Varistors 320V 14mm 2pin ThermoFuse Varistor

B72214R2321K101
EPCOS / TDK
1: $2.09
Lead-Time 22 Weeks

Mfr. Part #
B72214R2321K101

Mouser Part #
871-B72214R2321K101

Varistors 320V 14mm 2pin ThermoFuse Varistor

Datasheet

Lead-Time 22 Weeks

$2.09

$1.52

$1.38

$1.17

View

Min.: 1
Mult.: 1

Varistors 150VAC 10% 14mm AdvanceD Thermofused

B72214T2151K105
EPCOS / TDK
1,960: $1.29
Non-Stocked Lead-Time 20 Weeks

Mfr. Part #
B72214T2151K105

Mouser Part #
871-B72214T2151K105

Varistors 150VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 20 Weeks

$1.29

$1.20

$1.15

Min.: 1,960
Mult.: 980

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K106
EPCOS / TDK
1,960: $1.17
Non-Stocked Lead-Time 20 Weeks

Mfr. Part #
B72214T2171K106

Mouser Part #
871-B72214T2171K106

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 20 Weeks

$1.17

Min.: 1,960
Mult.: 980

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K106
EPCOS / TDK
1,960: $1.17
Non-Stocked Lead-Time 20 Weeks

Mfr. Part #
B72214T2301K106

Mouser Part #
871-B72214T2301K106

Varistors 300VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 20 Weeks

$1.17

Min.: 1,960
Mult.: 980

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K108
EPCOS / TDK
1,680: $1.18
Non-Stocked Lead-Time 20 Weeks

Mfr. Part #
B72214T2301K108

Mouser Part #
871-B72214T2301K108

Varistors 300VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 20 Weeks

$1.18

Min.: 1,680
Mult.: 560

Varistors 320VAC 10% 14mm AdvanceD Thermofused

B72214T2321K106
EPCOS / TDK
1,960: $0.904
Non-Stocked Lead-Time 20 Weeks

Mfr. Part #
B72214T2321K106

Mouser Part #
871-B72214T2321K106

Varistors 320VAC 10% 14mm AdvanceD Thermofused

Datasheet

Non-Stocked Lead-Time 20 Weeks

$0.904

$0.901

Min.: 1,960
Mult.: 980

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

B72214W2321K101
EPCOS / TDK
1,000: $1.20
Non-Stocked Lead-Time 22 Weeks

Mfr. Part #
B72214W2321K101

Mouser Part #
871-B72214W2321K101

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 22 Weeks

$1.20

$1.11

$1.07

Min.: 1,000
Mult.: 200

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

B72214W2381K101
EPCOS / TDK
1,000: $1.20
Non-Stocked Lead-Time 22 Weeks

Mfr. Part #
B72214W2381K101

Mouser Part #
871-B72214W2381K101

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 22 Weeks

$1.20

$1.11

$1.07

Min.: 1,000
Mult.: 200

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

B72220R2131K101
EPCOS / TDK
1: $4.40
Non-Stocked Lead-Time 22 Weeks

Mfr. Part #
B72220R2131K101

Mouser Part #
871-B72220R2131K101

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 22 Weeks

$4.40

$2.77

$2.46

$2.09

View

Min.: 1
Mult.: 1

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

B72220R2151K101
EPCOS / TDK
1: $4.40
Non-Stocked Lead-Time 22 Weeks

Mfr. Part #
B72220R2151K101

Mouser Part #
871-B72220R2151K101

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 22 Weeks

$4.40

$2.77

$2.46

$2.09

View

Min.: 1
Mult.: 1

Varistors 250VAC 10% 20mm 2-pin ThermoFuse

B72220R2251K101
EPCOS / TDK
1: $4.40
Lead-Time 22 Weeks

Mfr. Part #
B72220R2251K101

Mouser Part #
871-B72220R2251K101

Varistors 250VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Lead-Time 22 Weeks

$4.40

$2.77

$2.46

$2.09

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 2-pin ThermoFuse

B72220R2271K101
EPCOS / TDK
1: $2.57
Non-Stocked Lead-Time 22 Weeks

Mfr. Part #
B72220R2271K101

Mouser Part #
871-B72220R2271K101

Varistors 275VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Non-Stocked Lead-Time 22 Weeks

$2.57

$1.89

$1.72

$1.48

View

Min.: 1
Mult.: 1