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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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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (USD) Filter the results in the table by unit price based on your quantity.	Qty.
Varistors 385VAC 10% 20mm AdvanceD Thermofused B72220T2381K105 TDK 1: $2.85 500In Stock	Mfr. Part # B72220T2381K105 Mouser Part # 871-B72220T2381K105	TDK	Varistors 385VAC 10% 20mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	500In Stock	$2.85 $1.92 $1.72 $1.62 View $1.47 $1.23 $1.21 $1.18	Min.: 1 Mult.: 1
Industrial Surge Protectors 550V 25kA 10% 4pin 30mm B72230M0551M401 TDK 1: $13.10 346In Stock	Mfr. Part # B72230M0551M401 Mouser Part # 871-B72230M0551M401	TDK	Industrial Surge Protectors 550V 25kA 10% 4pin 30mm Learn More about TDK mt30 thermofuse varistors	Datasheet	346In Stock	$13.10 $9.68 $9.38 $8.79 View $7.86 $7.72	Min.: 1 Mult.: 1
Varistors 510VAC 10% 20mm AdvanceD Thermofused B72220T2511K105 TDK 1: $3.94 1,534In Stock	Mfr. Part # B72220T2511K105 Mouser Part # 871-B72220T2511K105	TDK	Varistors 510VAC 10% 20mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	1,534In Stock	$3.94 $2.49 $2.28 $1.94 View $1.82 $1.60 $1.34 $1.31 $1.29	Min.: 1 Mult.: 1
Varistors 275V 14mm 2pin ThermoFuse Varistor B72214R2271K101 TDK 1: $1.64 451In Stock	Mfr. Part # B72214R2271K101 Mouser Part # 871-B72214R2271K101	TDK	Varistors 275V 14mm 2pin ThermoFuse Varistor Learn More about TDK epcos nt thermofuse varistors	Datasheet	451In Stock	$1.64 $1.09 $0.965 $0.907 View $0.872 $0.829 $0.807 $0.794	Min.: 1 Mult.: 1
Varistors 175VAC 10% 14mm AdvanceD Thermofused B72214T2171K105 TDK 1: $1.83 385In Stock	Mfr. Part # B72214T2171K105 Mouser Part # 871-B72214T2171K105	TDK	Varistors 175VAC 10% 14mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	385In Stock	$1.83 $1.23 $1.09 $1.03 View $0.986 $0.929 $0.905 $0.896	Min.: 1 Mult.: 1
Varistors 275VAC 10% 20mm 2-pin ThermoFuse B72220R2271K101 TDK 1: $2.42 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72220R2271K101 Mouser Part # 871-B72220R2271K101	TDK	Varistors 275VAC 10% 20mm 2-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	Non-Stocked Lead-Time 10 Weeks	$2.42 $1.62 $1.37 $1.30 View $1.16 $1.03 $0.99 $0.969 $0.968	Min.: 1 Mult.: 1
Varistors 300VAC 10% 20mm 2-pin ThermoFuse B72220R2301K101 TDK 1: $2.01 941In Stock	Mfr. Part # B72220R2301K101 Mouser Part # 871-B72220R2301K101	TDK	Varistors 300VAC 10% 20mm 2-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	941In Stock	$2.01 $1.35 $1.23 $1.03 View $1.01 $0.996	Min.: 1 Mult.: 1
Varistors 320VAC 10% 20mm 2-pin ThermoFuse B72220R2321K101 TDK 1: $2.01 664In Stock	Mfr. Part # B72220R2321K101 Mouser Part # 871-B72220R2321K101	TDK	Varistors 320VAC 10% 20mm 2-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	664In Stock	$2.01 $1.35 $1.21 $1.14 View $1.01 $0.99 $0.967 $0.965	Min.: 1 Mult.: 1
Varistors 320VAC 10% 20mm AdvanceD Thermofused B72220T2321K105 TDK 1: $2.37 652In Stock 1,500Expected 11/4/2026	Mfr. Part # B72220T2321K105 Mouser Part # 871-B72220T2321K105	TDK	Varistors 320VAC 10% 20mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	652In Stock 1,500Expected 11/4/2026	$2.37 $1.60 $1.44 $1.35 View $1.31 $1.24 $1.22 $1.21 Quote	Min.: 1 Mult.: 1
Varistors 130VAC 10% 20mm 3-pin ThermoFuse B72220W2131K101 TDK 1: $2.44 580In Stock	Mfr. Part # B72220W2131K101 Mouser Part # 871-B72220W2131K101	TDK	Varistors 130VAC 10% 20mm 3-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	580In Stock	$2.44 $1.65 $1.48 $1.24 View $1.23 $1.17	Min.: 1 Mult.: 1
Varistors 275VAC 10% 20mm 3-pin ThermoFuse B72220W2271K101 TDK 1: $2.10 560In Stock	Mfr. Part # B72220W2271K101 Mouser Part # 871-B72220W2271K101	TDK	Varistors 275VAC 10% 20mm 3-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	560In Stock	$2.10 $1.42 $1.26 $1.19 View $1.13 $1.09 $1.06 $1.04	Min.: 1 Mult.: 1
Industrial Surge Protectors 510V 25kA 10% 4pin 30mm B72230M0511M401 TDK 1: $14.16 38In Stock	Mfr. Part # B72230M0511M401 Mouser Part # 871-B72230M0511M401	TDK	Industrial Surge Protectors 510V 25kA 10% 4pin 30mm Learn More about TDK mt30 thermofuse varistors	Datasheet	38In Stock	$14.16 $10.74 $9.56 $8.06 View $7.86 $7.77	Min.: 1 Mult.: 1
Varistors 300V 14mm 2pin ThermoFuse Varistor B72214R2301K101 TDK 1: $1.73 3,000On Order	Mfr. Part # B72214R2301K101 Mouser Part # 871-B72214R2301K101	TDK	Varistors 300V 14mm 2pin ThermoFuse Varistor Learn More about TDK epcos nt thermofuse varistors	Datasheet	3,000On Order On Order Ship Dates Mfr. #: B72214R2301K101 Stock: 0 On Order: 2,000 Expected 12/8/2026 1,000 Expected 12/14/2026 Factory Lead-Time: 10 Weeks	$1.73 $1.16 $1.03 $0.961 View $0.924 $0.83 $0.775 $0.773	Min.: 1 Mult.: 1
Varistors 150V 14mm 2pin ThermoFuse Varistor B72214R2151K101 TDK 1: $1.90 981Expected 1/8/2027	Mfr. Part # B72214R2151K101 Mouser Part # 871-B72214R2151K101	TDK	Varistors 150V 14mm 2pin ThermoFuse Varistor Learn More about TDK epcos nt thermofuse varistors	Datasheet	981Expected 1/8/2027	$1.90 $1.27 $1.13 $1.07 View $1.03 $0.967 $0.941 $0.885 $0.884	Min.: 1 Mult.: 1
Varistors 320V 14mm 2pin ThermoFuse Varistor B72214R2321K101 TDK 1,000: $0.829 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72214R2321K101 Mouser Part # 871-B72214R2321K101	TDK	Varistors 320V 14mm 2pin ThermoFuse Varistor Learn More about TDK epcos nt thermofuse varistors	Datasheet	Non-Stocked Lead-Time 10 Weeks	$0.829 $0.807 $0.765 $0.763	Min.: 1,000 Mult.: 1,000
Varistors 150VAC 10% 14mm AdvanceD Thermofused B72214T2151K105 TDK 1,960: $1.13 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72214T2151K105 Mouser Part # 871-B72214T2151K105	TDK	Varistors 150VAC 10% 14mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	Non-Stocked Lead-Time 10 Weeks	$1.13	Min.: 1,960 Mult.: 1,960
Varistors 175VAC 10% 14mm AdvanceD Thermofused B72214T2171K106 TDK 1,960: $0.93 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72214T2171K106 Mouser Part # 871-B72214T2171K106	TDK	Varistors 175VAC 10% 14mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	Non-Stocked Lead-Time 10 Weeks	$0.93	Min.: 1,960 Mult.: 1,960
Varistors 300VAC 10% 14mm AdvanceD Thermofused B72214T2301K106 TDK 1: $2.82 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72214T2301K106 Mouser Part # 871-B72214T2301K106	TDK	Varistors 300VAC 10% 14mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	Non-Stocked Lead-Time 10 Weeks	$2.82 $1.78 $1.35 $1.26 View $1.11 $0.931 $0.925 $0.923	Min.: 1 Mult.: 1
Varistors 300VAC 10% 14mm AdvanceD Thermofused B72214T2301K108 TDK 1,680: $0.93 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72214T2301K108 Mouser Part # 871-B72214T2301K108	TDK	Varistors 300VAC 10% 14mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	Non-Stocked Lead-Time 10 Weeks	$0.93	Min.: 1,680 Mult.: 1,680
Varistors 320VAC 10% 14mm AdvanceD Thermofused B72214T2321K106 TDK 1,960: $0.714 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72214T2321K106 Mouser Part # 871-B72214T2321K106	TDK	Varistors 320VAC 10% 14mm AdvanceD Thermofused Learn More about TDK epcos t varistor	Datasheet	Non-Stocked Lead-Time 10 Weeks	$0.714 $0.712 $0.711	Min.: 1,960 Mult.: 1,960
Varistors 320VAC 10% 14mm 3-pin ThermoFuse B72214W2321K101 TDK 1,000: $0.906 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72214W2321K101 Mouser Part # 871-B72214W2321K101	TDK	Varistors 320VAC 10% 14mm 3-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	Non-Stocked Lead-Time 10 Weeks	$0.906 $0.90 $0.85 $0.849	Min.: 1,000 Mult.: 1,000
Varistors 380VAC 10% 14mm 3-pin ThermoFuse B72214W2381K101 TDK 1: $1.82 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72214W2381K101 Mouser Part # 871-B72214W2381K101	TDK	Varistors 380VAC 10% 14mm 3-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	Non-Stocked Lead-Time 10 Weeks	$1.82 $1.21 $1.08 $1.01 View $0.972 $0.885 $0.87 $0.813 $0.811	Min.: 1 Mult.: 1
Varistors 130VAC 10% 20mm 2-pin ThermoFuse B72220R2131K101 TDK 750: $1.22 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72220R2131K101 Mouser Part # 871-B72220R2131K101	TDK	Varistors 130VAC 10% 20mm 2-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	Non-Stocked Lead-Time 10 Weeks	$1.22 $1.19 $1.17	Min.: 750 Mult.: 750
Varistors 150VAC 10% 20mm 2-pin ThermoFuse B72220R2151K101 TDK 1: $2.33 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72220R2151K101 Mouser Part # 871-B72220R2151K101	TDK	Varistors 150VAC 10% 20mm 2-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	Non-Stocked Lead-Time 10 Weeks	$2.33 $1.58 $1.41 $1.34 View $1.26 $1.20 $1.17 $1.15	Min.: 1 Mult.: 1
Varistors 250VAC 10% 20mm 2-pin ThermoFuse B72220R2251K101 TDK 1: $2.13 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # B72220R2251K101 Mouser Part # 871-B72220R2251K101	TDK	Varistors 250VAC 10% 20mm 2-pin ThermoFuse Learn More about TDK epcos nt thermofuse varistors	Datasheet	Non-Stocked Lead-Time 10 Weeks	$2.13 $1.43 $1.28 $1.21 View $1.14 $1.10 $1.05	Min.: 1 Mult.: 1

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