Fuses

The NH system is classified among plug-in fuse systems and is composed of:
* fuse-base (possibly including terminal covers and phase barriers)
* fuse-link with blade contact
* fuse-link replacement device (LV HRC fuse puller)
Since the design of this system cannot guarantee non-interchangeability of rated current it must be handled by a qualified professional.

Type "aM" NH fuse-links are partial-range breaking capacity fuse-links, used to protect motor circuits as they are strongly current-limiting and have low power losses. They interrupt currents from 6.3 times In up to their maximum breaking capacity and are therefore suited for short-circuit protection only. They must be associated with other switchgear for protection against overloads. These fuse-links can have a rated current equal to the motor's nominal current.

The majority of existing street lighting networks are normally protected by a common Feeder Protection Device (FPD). FDP is based on a simple overcurrent unidirectional technique to protect against faults on the street lighting cables. The Mersen fuse technology ensures safety in street lighting applications by providing better coordination, immediate isolation and ensures fire safety through safe and correct fuse selection.

The Mersen range of Low Voltage Feeder Pillar Fuse Links are designed for the use with wedge type fuse carriers with fixing centres of 82mm and 92mm. There are primarily for use by Electricity Supply Industries in distribution pillars, open type substation boards, heavy duty service cut-outs and underground disconnecting boxes.