CRMagnetics Catalog

TYPICAL RELAY APPLICATIONS

"A"

"B"

OPEN HEATER / LAMP DETECTOR

The relay may be used to provide an alarm signal to indicate an open

heater element. The current-carrying wire is routed through the window

opening. With the"EL" (Energized on Low current) option, when the

heater element draws current above the trip point, the relay remains de-

energized. If the element becomes open, the current level will be

reduced, causing the relay to become energized. Supply power is

constantly supplied to the relay with the "A" connection and the relay will

cycle every time the temperature controller cycles. Using the alternate

connection with line "B", power is provided to the relay only when the

temperature controller is cycled on. With this connection, the relay will

energize only when the element is open.

The trip ranges shown on page 15 represent one wire pass through the

window opening. The trip range may be changed by threading the

current-carrying wire through the window opening several times, as

shown above. The "actual" trip range would be the relay name plate

range divided by the number of wire passes through the opening. For

example, a name plate range of 6.0 to 60 ACA with three wire passes

would provide an actual range of 2.0 to 20 ACA (6 3=2.0 & 60 3=20).

EXTERNAL CURRENT TRANSFORMERS

The relay may be used with an external split or solid-core current

transformer. The external transformer can be used to access remote

loads or where the current-carrying wire is too large to fit through the

window opening in the relay. A standard, 5 Amp secondary, commercial

grade current transformer (see page 25) would be attached with the

secondary leads threaded twice through the window opening, as

illustrated. The trip range option "110" (1.0 to 10 ACA) would then

provide full-scale adjustment for the transformer.

MOTOR OVER / UNDER MONITOR

The relay may be used to monitor the operational load of a motor. One

leg of the motor wiring is routed through the window opening. With the

"EH" (Energized on High) option, when the motor current draw exceeds

the trip point, the relay will energize and open the motor starter. The time

delay would be set long enough to inhibit tripping during high inrush

starting current. Note that an electrical fuse and other overload devices

will still be required for complete motor protection.

ONE-WIRE PASS

THREE-WIRE PASS

CONNECTION TO INDICATOR LAMP

The current switch may be used to drive directly an indicating lamp.

When using the AC output version, either of the two black leads may be

attached to the power source. A snubber network is required when

connecting to an indictive device such as an electromechanical relay.

CONNECTION TO PLC

The current switch may be connected directly to a PLC. Supply power

may be provided from the PLC, as shown, or from an external power

source. When using a transistor output, the negative or black lead from

the switch is attached to the negative side of the supply.

351015

302520

"A"

"B"

351015

302520

OPEN HEATER / LAMP DETECTOR

The relay may be used to provide n alarm signal to indicate an open

heater lement. The current-carrying wire is routed through the window

opening. Wi the"EL" (Energized on Low current) ption, w n the

heater element draws current above the trip point, the relay remains de-

energized. If th element becomes open, the current level will be

reduced, causing the relay to become nergized. Sup ly power is

constantly su plied to th relay with the "A" connection and the relay will

cycle every time the temperature controller cycles. Using the alternate

co nection with line "B", power is provided to the rela only when the

te perature controller is ycled on. With this connection, the relay will

energize only when th element is open.

The trip range shown on page 15 prese t one wire pass through the

window opening. The trip range may be changed by threading the

current-carrying wire through the window opening several times, as

shown above. The "actual" trip range would be the rel y nam plate

range d vided by the number of wire passes through th opening. For

example, a name plate range of 6.0 to 60 ACA with thr e wir passes

would provide an actu l range of 2.0 to 20 ACA (6÷3=2.0 & 60÷3=20).

351015

302520

EXTERNAL CURRENT TRANSFORMERS

The relay may be used with an xternal split or solid-core current

transformer. Th external transformer can be used to access remote

loads or wh re the current-carrying wire is too large o fit through the

window ope ing in the relay. A st n ard, 5 Amp secondary, commercial

grade current transformer (Section F, Pages 92-105) would be attached with the

secondary leads threaded twice throug the window opening, as

illustrated. The trip range option "110" (1.0 to 10 ACA) would then

provide full-scale adjustment for the transformer.

MOTOR OVER / UNDER MONITOR

The relay may be used to monitor the operational l ad of a motor. One

leg of the m tor wiring is routed through the window opening. With the

"EH" (Energized on High) option, when the motor current draw exceeds

the tri poin , th relay will energize and open the motor starter. The time

delay would be set long enough to inhibit tripping during high inrush

starting current. No e th t an ele trical fuse and other overload devices

will still be required for complete motor protection.

ONE-WIRE PASS

THR E-WIRE PASS

CO NECTION TO INDICATOR LAMP

The current switch may be used to drive directly an indicating lamp.

When using the AC output version, ither of he two black leads may be

attached to the power source. A snubber network is required when

co necting to an ind ctive device such s an electromechanical relay.

CO NECTION TO PLC

The cu rent switch may be connected direc ly to a PLC. Sup ly power

may be provi ed from the PLC, as shown, or from an external power

source. When using a transist r o put, th negative or black lead from

the switch is attached to the negative side of the supply.

Typical Applications

Relays, Switches, & Sensors

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Web:

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M N TI

MOT VER / UNDER M TOR

The relay ay be used to onitor the operational lo d of a otor. One leg of the

motor wiring is routed through the window opening. With the “EH” (Energized on

High) trip status, when the motor current draw exceeds the trip point, the relay will

energize and open the starter motor. The time delay would be set long enough to in-

hibi tripping during high inrush starting current. Note that an elect ical fus and other

overload d vic s will be requir d for com lete motor protection.

CONNECTION TO INDICATOR LAMP

T ur nt switch may be used to directly an indic ting lamp. When using the AC

output version, either of the two black leads may be attached to the power sourc .

A snubber network is required when connecting to a indictive device such as a eletro-

mechanical relay.

CONNECTION TO PLC

The current switch may be connected directly to a PLC. Supply power may be provided

from the PLC, as shown, or from an external power source. When using a transistor

output, the negative or black lead from the switch is attached to the negative side of

the supply.

REN TRANSFORMERS

The relay ay be used with an external split or solid-core current transformer. The external

transformer can be used to access remote loads or where the current-carrying wire is too

large to fit through the window opening in the relay. A standard, 5 amp secondary, commer-

cial grade current transformer (Section F, Pages 94-107) would be attached with the second-

ary lea s threaded twic through the window opening, as illustrated. The trip range option

-110 (1.0 to 10 ACA) would then provide full-scale adjustment for the transformer.

ONE WIRE PASS THREE WIRE PASS

The trip ranges shown on Page 63 represent on wire pass through the window open-

ing. The trip range may be changed by threading the current-carrying wire through

the wind w opening several tim s, as shown bove. The “actual” trip range would be

the lay n me plate range divid d by the number of wir passes through the open-

ing. I.E. a name plate range of -660 (6.0 to 60 ACA) with three wire passes would

provide an actual range of 2.0 to 20 ACA (6/3=2.0 & 60/3=20).

OPEN HEA R / LAMP DETECT

r l y

i e n lar signal to indicate an open heat r ele-

ment. The current-carrying wire is routed through th wind w opening. With the

“EL” (Energized on Low) current status option, when the heater element draws cur-

rent above the trip point, the relay remains de-energized. If the element becomes

open, the current level will be reduced causing the relay to become energized. Sup-

ply power is constan ly supplied to e r lay with the “A” c nnection nd the relay

will cycl every tim th temperature contr ll

ycles. Using the alternate connec-

tion with line “B”, power is provided to the relay only when the temperature con-

troller is cycled on. With this connection, the relay will energize only when the

element is open.