High-speed Protistor® fuse for power semiconductor protection rated 400A, 1250VAC (IEC), 1300VAC (UL) with integrated striker and slotted blade terminals.
£172.00
The Mersen T300673 is an industrial electrical fuse designed to provide reliable overcurrent and short-circuit protection for compatible power, control and automation equipment. Manufactured by Mersen, a recognised specialist in electrical protection, this component helps safeguard electrical systems by interrupting potentially damaging fault currents.
When the current flowing through a circuit exceeds the fuse element's designed operating limit, the T300673 opens the circuit automatically. This helps restrict the thermal, electrical and mechanical stresses caused by a fault, reducing the risk of damage to conductors, control devices and other equipment within the electrical assembly.
The Mersen T300673 is suitable for maintenance, repair and OEM replacement applications where this exact manufacturer reference is specified. Before installation, the fuse's rated current, voltage, utilisation category, breaking capacity, dimensions and terminal arrangement should be verified against the original component or approved equipment documentation.
Overcurrents and short circuits can expose industrial equipment to excessive heat, electrical stress and mechanical forces. A correctly selected fuse responds by opening the affected circuit and limiting the amount of fault energy that reaches downstream components.
Correct fuse selection is essential for safe and dependable operation. A replacement component must match the required current rating, voltage rating, breaking capacity, operating characteristic, physical dimensions and connection arrangement. The T300673 should only be installed where this exact reference or a formally approved equivalent has been specified.
| Item number | T300673 |
|---|---|
| Catalogue No | A130UD72LI400 |
| Description | Square Body High-Speed Fuse Protistor® Size 72 aR 1250VAC IEC 1300VAC UL 400A With Striker Slotted Blades long |
| EAN/UPC Code | 3605340331967 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 400 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 72 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 270 kA²s |
| Melting I2t | 32.8 kA²s |
| AC Max I.R./Breaking Capacity | I1: 126 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | Slotted Blades |
| Product Width | 59 mm |
| Product Length | 157.4 mm |
| Product Height | 63 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 2.1699 kg |
| Sell Pack Width | 150 mm |
| Sell Pack Length | 190 mm |
| Sell Pack Height | 70 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.7233 kg |
| Power Dissipation at Rated Current Value | 80 W |
| HS Code | 85351000 |
The Mersen T300673 is used to provide overcurrent and short-circuit protection within compatible industrial electrical equipment and assemblies.
It can be used where the equipment manufacturer specifies Mersen T300673. The electrical ratings, dimensions, operating class and terminal arrangement must be verified before installation.
A different fuse should not be substituted unless it has been formally approved as compatible. Its current rating, voltage rating, breaking capacity, operating characteristic and physical format must meet the equipment requirements.
No. The T300673 is a non-resettable protection component and must be replaced after its fusible element has operated.
Installation should be completed by a suitably qualified electrical professional after the equipment has been safely isolated and the required fuse specification has been confirmed.
Mersen fuse products are widely used by electrical engineers, equipment manufacturers and maintenance professionals to support dependable circuit protection across industrial power, automation and control systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...