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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 AdvanceD Thermofused

B72220T2321K105
TDK
1: $3.67
1,652In Stock

Mfr. Part #
B72220T2321K105

Mouser Part #
871-B72220T2321K105

TDK

Varistors 320VAC 10% 20mm AdvanceD Thermofused

Datasheet

1,652In Stock

$3.67

$2.72

$2.48

$2.22

View

Min.: 1
Mult.: 1

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

B72230M0511M401
TDK
1: $19.74
58In Stock

Mfr. Part #
B72230M0511M401

Mouser Part #
871-B72230M0511M401

TDK

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

Datasheet

58In Stock

$19.74

$15.45

$13.75

$12.05

View

Min.: 1
Mult.: 1

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

B72220R2321K101
TDK
1: $2.74
794In Stock

Mfr. Part #
B72220R2321K101

Mouser Part #
871-B72220R2321K101

TDK

Varistors 320VAC 10% 20mm 2-pin ThermoFuse

Datasheet

794In Stock

$2.74

$2.02

$1.84

$1.60

View

Min.: 1
Mult.: 1

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

B72220W2131K101
TDK
1: $3.15
590In Stock

Mfr. Part #
B72220W2131K101

Mouser Part #
871-B72220W2131K101

TDK

Varistors 130VAC 10% 20mm 3-pin ThermoFuse

Datasheet

590In Stock

$3.15

$2.33

$2.13

$1.86

View

Min.: 1
Mult.: 1

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

B72230M0551M401
TDK
1: $18.42
349In Stock

Mfr. Part #
B72230M0551M401

Mouser Part #
871-B72230M0551M401

TDK

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

Datasheet

349In Stock

$18.42

$14.18

$12.96

$12.70

View

Min.: 1
Mult.: 1

Varistors 510VAC 10% 20mm AdvanceD Thermofused

B72220T2511K105
TDK
1: $5.67
1,534In Stock

Mfr. Part #
B72220T2511K105

Mouser Part #
871-B72220T2511K105

TDK

Varistors 510VAC 10% 20mm AdvanceD Thermofused

Datasheet

1,534In Stock

$5.67

$3.59

$3.28

$2.79

View

Min.: 1
Mult.: 1

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

B72230M0151M401
TDK
1: $16.44
395In Stock

Mfr. Part #
B72230M0151M401

Mouser Part #
871-B72230M0151M401

TDK

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

Datasheet

395In Stock

$16.44

$11.66

$11.65

$11.56

View

Min.: 1
Mult.: 1

Varistors 150V 14mm 2pin ThermoFuse Varistor

B72214R2151K101
TDK
1: $2.45
638In Stock

Mfr. Part #
B72214R2151K101

Mouser Part #
871-B72214R2151K101

TDK

Varistors 150V 14mm 2pin ThermoFuse Varistor

Datasheet

638In Stock

$2.45

$1.80

$1.64

$1.39

View

Min.: 1
Mult.: 1

Varistors 275V 14mm 2pin ThermoFuse Varistor

B72214R2271K101
TDK
1: $2.12
532In Stock

Mfr. Part #
B72214R2271K101

Mouser Part #
871-B72214R2271K101

TDK

Varistors 275V 14mm 2pin ThermoFuse Varistor

Datasheet

532In Stock

$2.12

$1.56

$1.40

$1.19

View

Min.: 1
Mult.: 1

Varistors 300V 14mm 2pin ThermoFuse Varistor

B72214R2301K101
TDK
1: $2.12
987In Stock

Mfr. Part #
B72214R2301K101

Mouser Part #
871-B72214R2301K101

TDK

Varistors 300V 14mm 2pin ThermoFuse Varistor

Datasheet

987In Stock

$2.12

$1.56

$1.40

$1.19

View

Min.: 1
Mult.: 1

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K105
TDK
1: $2.36
385In Stock

Mfr. Part #
B72214T2171K105

Mouser Part #
871-B72214T2171K105

TDK

Varistors 175VAC 10% 14mm AdvanceD Thermofused

Datasheet

385In Stock

$2.36

$1.74

$1.58

$1.41

View

Min.: 1
Mult.: 1

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

B72220R2301K101
TDK
1: $2.59
941In Stock

Mfr. Part #
B72220R2301K101

Mouser Part #
871-B72220R2301K101

TDK

Varistors 300VAC 10% 20mm 2-pin ThermoFuse

Datasheet

941In Stock

$2.59

$1.92

$1.74

$1.73

View

Min.: 1
Mult.: 1

Varistors 385VAC 10% 20mm AdvanceD Thermofused

B72220T2381K105
TDK
1: $3.05
500Expected 2026-07-03

Mfr. Part #
B72220T2381K105

Mouser Part #
871-B72220T2381K105

TDK

Varistors 385VAC 10% 20mm AdvanceD Thermofused

Datasheet

500Expected 2026-07-03

$3.05

$2.28

$2.07

$1.86

View

Min.: 1
Mult.: 1

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

B72220W2271K101
TDK
1: $2.71
632Expected 2026-07-30

Mfr. Part #
B72220W2271K101

Mouser Part #
871-B72220W2271K101

TDK

Varistors 275VAC 10% 20mm 3-pin ThermoFuse

Datasheet

632Expected 2026-07-30

$2.71

$2.00

$1.83

$1.58

View

Min.: 1
Mult.: 1

Varistors 320V 14mm 2pin ThermoFuse Varistor

B72214R2321K101
TDK
1: $2.12
Lead-Time 10 Weeks

Mfr. Part #
B72214R2321K101

Mouser Part #
871-B72214R2321K101

TDK

Varistors 320V 14mm 2pin ThermoFuse Varistor

Datasheet

Lead-Time 10 Weeks

$2.12

$1.56

$1.40

$1.19

View

Min.: 1
Mult.: 1

Varistors 150VAC 10% 14mm AdvanceD Thermofused

B72214T2151K105
TDK
1,960: $1.53
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

$1.53

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

Varistors 175VAC 10% 14mm AdvanceD Thermofused

B72214T2171K106
TDK
1,960: $1.28
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

$1.28

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

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K106
TDK
1,960: $1.28
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

$1.28

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

Varistors 300VAC 10% 14mm AdvanceD Thermofused

B72214T2301K108
TDK
1,680: $1.31
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

$1.31

$1.28

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

Varistors 320VAC 10% 14mm AdvanceD Thermofused

B72214T2321K106
TDK
1,960: $0.979
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

$0.979

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

Varistors 320VAC 10% 14mm 3-pin ThermoFuse

B72214W2321K101
TDK
1: $2.22
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

$2.22

$1.63

$1.48

$1.25

View

Min.: 1
Mult.: 1

Varistors 380VAC 10% 14mm 3-pin ThermoFuse

B72214W2381K101
TDK
1,000: $1.19
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

$1.19

$1.08

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

Varistors 130VAC 10% 20mm 2-pin ThermoFuse

B72220R2131K101
TDK
750: $1.68
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

$1.68

$1.53

Min.: 750
Mult.: 750

Varistors 150VAC 10% 20mm 2-pin ThermoFuse

B72220R2151K101
TDK
750: $1.68
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

$1.68

$1.53

Min.: 750
Mult.: 750

Varistors 250VAC 10% 20mm 2-pin ThermoFuse

B72220R2251K101
TDK
1: $2.59
Lead-Time 10 Weeks

Mfr. Part #
B72220R2251K101

Mouser Part #
871-B72220R2251K101

TDK

Varistors 250VAC 10% 20mm 2-pin ThermoFuse

Datasheet

Lead-Time 10 Weeks

$2.59

$1.92

$1.74

$1.51

View

Min.: 1
Mult.: 1