What is SMU Fuses?

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What is SMU Fuses?

SMU Fuse Units — Fusible Element SMU Fuse Units feature silver or pretensioned nickel-chrome current-responsive elements that are drawn through precision dies to very accurate diameters. They’re of solderless construction, brazed into their terminals.

What is a power fuse?

Power fuses are a generally accepted means of protecting power transformers in distribution substations. The primary purpose of a power fuse is to provide interruption of permanent faults. Fusing is an economical alternative to circuit switcher or circuit breaker protection.

What SMU 20 fuse?

The SMU-20 Fuse Unit consists of a fusible element, an arcing rod, and a solid-material arc-extinguishing medium contained within a filament-wound glass- epoxy tube. See Figure 8. One end of the fusible element is connected, through the current-transfer bridge, to the exhaust ferrule.

How many types of fuses are there?

The low voltage fuses are divided into five types and those are of the rewirable, cartridge, drop out, striker, and switch fuses.

What is the cross reference number for the smu-20 power fuse?

S&C Electric SMU-20 and Cooper Power Systems CMU-20 power fuse cross reference No.: CP-0507 Rev.01 E-Ref.: None Supersedes: 5/15/2005 File Ref.: Cat. Sec. 240-94 Date: 06/09/06

What is the use of contact fingers in smu-20?

contact fingers prevents the fuse unit from recoiling from the latched position during closing. The fuse unit can’t drop out due to vibration or shock. Superb Current Transfer Superb current transfer between the SMU-20 Fuse Unit and the upper and lower contacts is ensured, even after exposure to the elements for an extended period of time.

Are SMD 20 fuses easy to use?

SMD-20 Power Fuses, in contrast, are easy to handle. SMU-20 Fuse Units are light and readily maneuvered at the end of a hotstick. The positive, self-guiding action of the fuse hinge and trunnion permits nearly effortless opening and closing operations.

What is the purpose of a high voltage discharge fuse?

Used in distribution substations and switchgear for protection of transformers, lines, cables, and capacitors where there are higher loads, higher fault currents, and higher voltages that are beyond capabilities of standard expulsion fuses.

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