06.01.2025
Littelfuse’s UL Class CF and J Fuses Cross Reference Guide
Discover Littelfuse’s latest fuses cross reference guide
Littelfuse's Fuse Cross Reference Guide
Littelfuse offers class J fuses that can be used as a replacement for existing Class CF fuses. The UL-listed Class J fuses provide great versatility, are widely available and offer almost twice the ampere rating selection than Class CF fuses. They offer maximum protection in a compact size and are available in indicator and non-indicator versions.
JTD Series – UL Class J Time-delay Fuses
JTD_ID Series – UL Class J Time-delay fuses with indication
JLS Series – UL Class J Fast-acting Fuses
Littelfuse offers three types of current-limiting Class J fuses to meet the needs of circuit protection in industrial and electrical power generation and transmission applications. Littelfuse’s fast-acting JLS series of fuses provide space-saving overload and short-circuit protection in industrial and power conversion applications. JTD time-delay fuses employ POWR-PRO technology to ensure very high interrupting ratings and are specifically designed for use where space is limited.
Littelfuse’s Fuses Cross Reference Guide
Specifications – Time-Delay Fuses
| Series/Model | TCF/TCF_RN | JTD/JTD_ID |
| Manufacturer: | Bussmann | Littelfuse |
| Ampere Range: | 6-400A | 8/10 – 600 A |
| Ac Voltage Rating: | 600V | 600 V |
| Ac Interrupting Rating: | 300,000 A (up to 100 A UL)
200,000 A (110 – 400 A UL) |
300,000 A (Self-certified)
200,000 A (UL) |
| Dc Voltage Rating: | 300 V | 300 V (8/10 – 100 A) 500 V (110 – 600 A) |
| Dc Interrupting Rating: | 100,000 A | 20,000 A |
| Environmental: | RoHS 2011/65/EU | RoHS 2015/863/EU (JTD 225-600 A; JTD-R 35-60 A) |
| Agency Approvals: | UL Listed Class CF – E4273
CSA (053787_C_000) CE (up to 100 A) |
UL Listed Class J (E81895)
CSA (029862) CE (JTD 225-600 A; JTD-R 35-60 A) |
| Operating Temperature: | -40 °C to 80 °C
(-40 °F to 176 °F) |
-55 °C to 125 °C
(-67 °F to 257 °F) |
| Datasheet Links: | TCF Series Datasheet | JTD Series Datasheet
JTD with Indicator Series Datasheet |
Electrical Specifications – Time-Delay Fuses
| Ampere Rating | TCF/TCF_RN | JTD/JTD_ID |
| Watts Loss at 100% Rated Current | Watts Loss at 100% Rated Current | |
| 30 | 4 | 4.3 |
| 60 | 6.2 | 6.4 |
| 100 | 9.5 | 7.5 |
| 200 | 19 | 18.4 |
| 400 | 35.2 | 40 |
Cross Reference Guide – Time-Delay Fuses
| Bussmann UL Class CF Fuse | Littelfuse UL Class J Fuse | ||
| Non-indicating | Indicating | Non-indicating | Indicating |
| TCF1RN | – | 0JTD001.T | 0JTD001.TXID |
| TCF3RN | – | 0JTD003.T | 0JTD003.TXID |
| TCF6RN | TCF6 | 0JTD006.T | 0JTD006.TXID |
| TCF10RN | TCF10 | 0JTD010.T | 0JTD010.TXID |
| TCF15RN | TCF15 | 0JTD015.T | 0JTD015.TXID |
| TCF17-1/2RN | TCF17-1/2 | 0JTD017.5T | 0JTD017.5TXID |
| TCF20RN | TCF20 | 0JTD020.T | 0JTD020.TXID |
| TCF25RN | TCF25 | 0JTD025.T | 0JTD025.TXID |
| TCF30RN | TCF30 | 0JTD030.T | 0JTD030.TXID |
| TCF35RN | TCF35 | 0JTD035.T | 0JTD035.TXID |
| TCF40RN | TCF40 | 0JTD040.T | 0JTD040.TXID |
| TCF45RN | TCF45 | 0JTD045.T | 0JTD045.TXID |
| TCF50RN | TCF50 | 0JTD050.T | 0JTD050.TXID |
| TCF60RN | TCF60 | 0JTD060.T | 0JTD060.TXID |
| TCF70RN | TCF70 | 0JTD070.V | 0JTD070.VXID |
| TCF80RN | TCF80 | 0JTD080.V | 0JTD080.VXID |
| TCF90RN | TCF90 | 0JTD090.V | 0JTD090.VXID |
| TCF100RN | TCF100 | 0JTD100.V | 0JTD100.VXID |
| TCF110RN | TCF110 | 0JTD110.X | 0JTD110.XXID |
| TCF125RN | TCF125 | 0JTD125.X | 0JTD125.XXID |
| TCF150RN | TCF150 | 0JTD150.X | 0JTD150.XXID |
| TCF175RN | TCF175 | 0JTD175.X | 0JTD175.XXID |
| TCF200RN | TCF200 | 0JTD200.X | 0JTD200.XXID |
| TCF225RN | TCF225 | 0JTD225.X | 0JTD225.XXID |
| TCF250RN | TCF250 | 0JTD250.X | 0JTD250.XXID |
| TCF300RN | TCF300 | 0JTD300.X | 0JTD300.XXID |
| TCF350RN | TCF350 | 0JTD350.X | 0JTD350.XXID |
| TCF400RN | TCF400 | 0JTD400.X | 0JTD400.XXID |
Specifications – Fast Acting Fuses
| Series/Model | FCF_RN | JLS |
| Manufacturer: | Bussmann | Littelfuse |
| Ampere Range: | 1-100A | 1 – 600 A |
| Ac Voltage Rating: | 600V | 600 V |
| Ac Interrupting Rating: | 300,000 A (up to 60 A UL)
200,000 A (70- 100 A UL) |
200,000 A (UL)
|
| Dc Voltage Rating: | 600 V | N/A |
| Dc Interrupting Rating: | 50,000 A | N/A |
| Environmental: | RoHS 2011/65/EU | RoHS 2015/863/EU |
| Agency Approvals: | UL Listed Class CF – E4273
CSA (053787_C_000) CE |
UL Listed Class J (E81895)
CSA (LR29862) CE |
| Operating Temperature: | -40 °C to 80 °C
(-40 °F to 176 °F) |
-55 °C to 125 °C
(-67 °F to 257 °F) |
| Datasheet Links: | FCF_RN Series Datasheet | JLS Series Datasheet |
Cross Reference Guide – Fast-Acting Fuses
| Bussmann UL Class CF Fuse | Littelfuse UL Class J Fuse | ||
| FCF1RN | – | 0JLS001.T | – |
| FCF3RN | – | 0JLS003.T | – |
| FCF6RN | – | 0JLS006.T | – |
| FCF10RN | – | 0JLS010.T | – |
| FCF15RN | – | 0JLS015.T | – |
| FCF20RN | – | 0JLS020.T | – |
| FCF25RN | – | 0JLS025.T | – |
| FCF30RN | – | 0JLS030.T | – |
| FCF35RN | – | 0JLS035.T | – |
| FCF40RN | – | 0JLS040.T | – |
| FCF45RN | – | 0JLS045.T | – |
| FCF50RN | – | 0JLS050.T | – |
| FCF60RN | – | 0JLS060.T | – |
| FCF70RN | – | 0JLS070.V | – |
| FCF80RN | – | 0JLS080.V | – |
| FCF90RN | – | 0JLS090.V | – |
| FCF100RN | – | 0JLS100.V | – |
Explore the full Littelfuse cross reference guide here.
For further information on Littelfuse’s fuse range please contact GD Rectifiers on 01444 243 452 or email [email protected].
