a
Energy Conservation Relays
In many applications it is important for the customer to conserve electrical energy. One approach to energy conservation in
an electrical system is to use relays that do not require constant power to maintain contact closure.
Latching relay is a generic term that is used to describe a relay that maintains its contact position after the control power
has been removed. Latching relays allow a customer to control a circuit by simply providing a single pulse to the relay control
circuit. Latching relays are also desirable when the customer needs to have a relay that maintains its position during an
interruption of power.
There are three main types of Latching relays. Magnetic latching, Mechanical Latching and Impulse Sequencing.
Magnetic Latching Relays
Magnetic Latching relays require one pulse of coil power to move their contacts in one direction, and another, redirected pulse
to move them back. Repeated pulses from the same input have no effect. Magnetic Latching relays are useful in applications
where interrupted power should not be able to transition the contacts.
Magnetic Latching relays can have either single or dual coils. On a single coil device, the relay will operate in one direction
when power is applied with one polarity, and will reset when the polarity is reversed. On a dual coil device, when polarized
voltage is applied to the reset coil the contacts will transition. AC controlled magnetic latch relays have single coils that
employ steering diodes to differentiate between operate and reset commands.
Mechanical Latching Relays
Mechanical latching relays use a locking mechanism to hold their contacts in their last set position until commanded to change
state, usually by means of energizing a second coil. Since the relay does not rely on a magnet, the locking strength will
not degrade over time or weaken during thermal cycling. The contacts will remain locked in the directed position until the
opposing coil has been energized. Packaging machinery that places several units into a single container would be a good
example.
Impulse Relays
Impulse relays are a form of latching relay that transfers the contacts with each pulse. Many impulse relays are made up of a
magnetic latch relay and a solid state steering circuit that, upon application of power, determines which position the relay is
in and energizes the opposite coil. The contacts transfer and hold that position when power is removed. When reenergized,
the contacts transfer again and hold that position, and so on. In order to transfer the contacts, one simply provides a single
unidirectional pulse. There is no need to redirect the control pulse or reverse the polarity.
Impulse relays can be used as wear equalizers. They are well suited for applications such as turning a single device on or off
from one or more locations with a single momentary switch or push button at each station. For example, a conveyor could be
started and/or stopped from multiple locations by means of a single button at each position.
7/2 Magnecraft Solution Guide 105A
SECTION 7
Magnecraft Solution Guide 105A
INDUSTRIAL
AUTOMATION
PACKING
MACHINES
PUMPING
MACHINES
COMPRESSORS
INDUSTRIAL
FANS
INDUSTRIAL
APPLIANCES
www.magnecraft.com 847-441-2540
Alternating Relay Application Data
Applications:
712 Alternating Relay
In many industrial pumping applications, two identical pumps are used for the same job. A standby unit is available in case
the first pump fails. However, a completely idle pump might deteriorate and provide no safety margin. Alternating relays
prevent this by assuring that both pumps get equal run time.
The Model 712 Series Alternating Relay is designed for duplex pumping systems where it is desirable to equalize pump run
time. The solid state alternating circuit drives an internal electromechanical relay. A continuous power source and control
switch is required.
The control switch (float, pressure or other isolated contact) is connected as shown in the respective wiring diagrams. Each
time the control switch is opened the output contacts will change status. Indicator lights on the case show the internal relay
status.

Setting the top toggle switch to the center position alternates the load; while setting the switch to Load 1 or Load 2 will
lock the relay in the respected position, preventing alternation.
The alternating relay approach isnt limited to pumping applications. The control switches could be thermostats or pressure
switches, and the loads could be fans or compressors.
7/3 SECTION 7
Magnecraft Solution Guide 105A
Magnecraft Solution Guide 105A
1.40
(35.6)
1.54
(39.1)
2.63
(66.8)
A
A1
7
11
14
4
12
1
B
A2
9
21
24
6
22
3
.187 QUICK CONNECTS
CONTACTS
7 & 4
7 & 1
CLOSED
9 & 6
9 & 3
INDICATING LEDS
IEC
NEMA
+ UL Recognized
File No. E43641
711 Impulse Sequencing Relay/
DPDT 12 Amp Rating
LED Indicates
Closed Contact
Optional Flange
and DIN Adapter
Mounting
The 711 Impulse Sequencing relay is an
alternating relay used for load sharing
or toggling ON/OFF of the load. Uni-
directional momentary pulses cause the
contacts to transfer from one side to the
other. There is no need to redirect the
polarity of the input in order to change
and maintain states.
WIRING DIAGRAM
Standard Blade Style Socket
Mounting Configuration
Units
A
V
Resistive
Resistive
HP
HP
mA
V
V
VA
W
(Resistive)
ms
V(rms)
V(rms)
V(rms)
°C
°C
g-n
g-n
grams
711XBX
DPDT
Silver Alloy
12
300
12A @ 240V 50/60Hz
12A @ 28V
1/3 @ 120 VAC
1/2 @ 240 VAC
100 @ 5VDC (.5W)
12.120, 50/60 Hz
12.110
85% to 110%
80% to 110%
1.8
1.8
15%
10%
100,000
10,000,000
35
1500
500
1500
UL
-40+85
-40+55
3, 10 - 55 Hz
10
IP 40
110
% of Nominal
Operations @ Rated Current
Unpowered
Between coil and contact
Between poles
Between contacts
Standard version
Storage
Operation
Operational
Contact Characteristics
Number and type of Contacts
Contact materials
Thermal (Carrying) Current
Maximum Switching Voltage
Switching Current @ Voltage
Minimum Switching Requirement
Coil Characteristics
Voltage Range
Operating Range
Average consumption
Drop-out voltage threshold
Performance Characteristics
Electrical Life (UL508)
Mechanical Life
Operating time (response time)
Dielectric strength
Environment
Product certifications
Ambient air temperature
around the device
Vibration resistance
Shock resistance
Degree of protection
Weight
General Specifications
(UL 508)
~
~
~
~
~
~
~
~
7/4 Magnecraft Solution Guide 105A
SECTION 7
Magnecraft Solution Guide 105A
2.63
(66.8)
(80)
3.14
(26)
1.03
(81)
3.18
(91)
3.6
0.40
(10)
Other mating sockets see Section 2: 70-124-1, 70124-2, 70178-1, 70-178-2
16-711C1
Section 3, p.14-16
16-711C4
Section 3, p.14-16
711 Relay with the
70-463-1 Socket
BOLD-FACED PART NUMBERS ARE NORMALLY STOCKED
www.magnecraft.com 847-441-2540
Coil Resistance
70 Ohms
220 Ohms
5700 Ohms
70 Ohms
220 Ohms
880 Ohms
5700 Ohms
Part Number
(Without LEDs)
711XBXC-12A
711XBXC-24A
711XBXC-120A
711XBXC-12D
711XBXC-24D
711XBXC-48D
711XBXC-110D
Part Number
(With LEDs)
711XBXCL-12A
711XBXCL-24A
711XBXCL-120A
711XBXCL-12D
711XBXCL-24D
711XBXCL-48D
711XBXCL-110D
Nominal Voltage
AC Operated
12 VAC 50/60 HZ
24 VAC 50/60 HZ
120 VAC 50/60 HZ
DC Operated
12 VDC
24 VDC
48 VDC
110 VDC
Standard Part Numbers
70-463-1
SOCKET
16-1351
Metal Hold-Down Clip
See Section 3 p.8-11
Relay
Adapters
7/5 SECTION 7
Magnecraft Solution Guide 105A
Magnecraft Solution Guide 105A
Load 1 Indicator
Indicates when Load 1 is Active.
Top Toggle Switch
To Lock Load in Position.
Highest Grade
Electronic Components
RoHS Compliant.
Industry Standard 8 or 11 Pin
Octal Socket Compatible
Easy Installation and Replacement.
Industry Proven Power
Relay Technology
12 Amp Relay with
Dual Voltage Capability.
UL Listed when 712 Relay
and Octal Socket are Combined
UL Approved for Field Replacement.
Load 2 Indicator
Indicates when Load 2 is Active.
The Complete
System
Solution!
Advantages of the 712 Alternating Relay
The Model 712 series Alternating Relay is designed for duplex
pumping systems where it is desirable to equalize pump run time.
The solid state alternating circuit drives an internal electromechanical
relay. A continuous power source and control switch are required.
The control switch (float, pressure or other isolated contact) is
connected between the L1 terminal and the control terminal. Each
time the control switch is opened the output contacts will change
status. Indicator lights on the case show the internal relay status.
Setting the top toggle switch to Load 1 or Load 2 will lock the relay
in position, preventing alternation.
Offers a one stop solution for
your pump management system.
Several configurations available
to meet your individual needs.
Switching capabilities up to 12 amps.
Two LED status indicators; indicate status
of the separate loads independently.
Dual Voltage Coils eliminate the
need to specify AC or DC (AC only
for 240 volts).
Only 36 mms wide; does not take up
any additional room on the DIN rail.
Color and appearance designed for
high visibility in all environments.
Engineering availability allows for
customized control system solutions.
16-711C1
FLANGE ADAPTER
16-711C4
DIN RAIL ADAPTER
See Section 3 p.14-16
7/6 Magnecraft Solution Guide 105A
SECTION 7
Magnecraft Solution Guide 105A
Load 1 Indicator
Indicates when Load 1 is Active.
Top Toggle Switch
To Lock Load in Position.
Highest Grade
Electronic Components
RoHS Compliant.
Industry Standard 8 or 11 Pin
Octal Socket Compatible
Easy Installation and Replacement.
Industry Proven Power
Relay Technology
12 Amp Relay with
Dual Voltage Capability.
UL Listed when 712 Relay
and Octal Socket are Combin