IMO, using a 250mA fuse is quite possibly a choice made by economics. 250mA is 1/4A and a very common fuse rating compared to others in the mA range. .0632 Amp fuse for 4-20 ma circuits.

What are the names of all the fuses?

EDIT: Added cross references to specific fuse-related posts by QSilver7, RDL, cn90, & JimLev 3/13/2013. EDIT: Added nice closeup of EF1 to EF5 by tobesscooby 4/6/2013. EDIT: Added better descriptions for F107 to F114 by rdl on 4/8/2013 (and added fuse amperages for the unknown fuses, again, as per rdl ).

### How to choose the right overcurrent for a fuse?

1 Voltage Rating 2 Current Rating 3 Interrupting Rating 4 Temperature Derating 5 Melting Integral (I 2 t) 6 Maximum Circuit Fault Current 7 Required Agency Approvals 8 Mechanical Considerations

What’s the definition of a medium voltage fuse?

Medium voltage fuses are defined as fuses with a voltage rating greater than 1,500V and less than or equal to 36,000V (36kV). These are popular fuses due to their reliable performance, low price and blown fuse indicator function.

#### Why do you need a fuse in a 4-20 mA circuit?

If you look at the literature rarely do you see a fuse in the “sketch” but the reality is that the use of a fuse in a 4-20 ma circuit is just good engineering practice. This site shows the fuse: https://instrumentationblog.com/4-20-ma-current-loop/ A fuse in each loop protects 1) the loop and 2) the other loops from a common mode failure.

Where is the battery fuse on an ECM?

The first thing to check is the ECM Battery fuse located in the power distribution center. In this video we show you how! Loading…

## Why do you need a 5 Amp Fuse?

In industrial applications, power spikes, surges and malfunctions can lead to instrument loop failures. The fuse will protect these sensitive devices in most cases. If one installs a .5 amp fuse there really is not much if any protection since this would pass 25 times the design loop current.

How big is a fuse on a wire?

It is sized to the ampacity of the wire. The wiring is what is sized to a 125% of the load, not the fuse.