Boxes with transport covers for mounting through an external panel, or the door, of an equipment cubicle. The boxes will house any RP Relay or module, especially flag relays. The covers of the boxes can be taken off to gain access to the relays without it being necessary to open the main cubicle.

RP/A, 307, 3000, and 600 type relays can all be made in magnetic latching versions, called Remanent Relays. The coil core of a Remanent Relay is made from a special steel in place of the normal soft iron. This core becomes a permanent magnet when a current is passed through the coil of the relay. This holds the armature in the closed position after the energising current has been removed. The Relay is released by passing a reverse pulse through the main coil or a secondary coil.

Arc Blow-out Magnets

These relays monitor the output from a current transformer. A solid state trigger in the Relay measures this signal and drives the output relay.

When power is applied to this unit the output Relay operates and releases cyclically until such time as the power is removed.

When power is applied to a Fleeting Relay the Relay will energise, remain energised for an interval and then release.

On a Relay with a fleeting contact the Relay operates normally but one contact fleets.

A module containing a solid state trigger which drives a relay. The solid state trigger is very sensitive and accurate.

These relays will energise at within 1.5% of a set voltage. The energise-release differential can be adjusted down to 1.5% of the set voltage.

Various mounting devices for RP Relays. Front and rear screw terminal sockets.

The socket, base and cover of the standard RP Relay provide the structure for these component mounts.

These types are all of substantially the same design. It is one of the most versitile and sensitive Relay constructions ever produced. Thousands of millions have been built and proved to be very reliable.

We can manufacture them to PO data sheets or tailored to meet customers' own requirements.

This is a smaller and less sensitive Relay than the 3000 type. It can have a maximum of 12 contact springs. It is used instead of the 3000 type where the circuit requirement is less critical.

These relays have pull-in and drop-out times of less than 3 msecs. The 3/402 has one changeover contact and the 3/412 has two, rated at 1 Amp non-inductive 50 V dc, or 300 mA inductive.

This Relay has the same coil and magnectic circuit as the 3000 type but is fitted with larger contact blades and contact tips. The contacts have considerable wip which enables the same contact to be equally suitable for carrying 1 mA or 10 Amps (or 30 Amps intermittently). The integral saddle bracket facilitates mounting.

We design and build control units, from small wall-mounted boxes to full-size cubicles. These may incorporate relays, solid state switching and pneumatics. Quantities range from one-off to several hundred. The final users of these units have included NCB, CEGB and the BBC.

These units will detect the drop in voltage that there will be on one line of a three-phase supply when a fault occurs and motor regenerated voltage is present. The output Relay energises on fault.

The PFD 2D has an integral time delay.

The PFD 500 is a similar unit in which the output Relay is energised when the supply is healthy.

Phase Failure and Reversal

This unit will. detect phase reversal. It will also detect a complete loss of voltage on one phase. It will not respond to phase failure in the presence of motor regenerated voltage. The output Relay is energised when the supply is healthy.