Cut Sheet

V7-T3-190 Volume 7—Logic Control, Operator Interface and Connectivity Solutions CA08100008E—July 2015 www.eaton.com
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3.9
Control Relays and Timers
Alternating Relays
Technical Data and Specifications
D85 Series—Alternating Relays
Wiring Diagrams
D851 Series Relays, SPDT D852 Series Relays, DPDT
Typical Installations for SPDT and DPDT Alternating Relays,
Standard Installation
In the OFF state (standard
installation), the control
switch is open, the
alternating relay is in the
LOAD A position, and both
loads (M1 and M2) are off.
When the control switch
closes, it energizes the first
load (M1). The red LED
marked “LOAD A” glows. As
long as the control switch
remains closed, M1 remains
energized.
When the control switch
opens, the first load (M1) is
turned off and the alternating
relay toggles to the LOAD B
position. When the control
switch closes again, it
energizes the second load
(M2). The red LED marked
“LOAD B” glows.
Description Specification
Voltage tolerance +10%/-15% of control voltage at 50/60 Hz
Load (burden) Less than 3 VA
Output contacts 10 A resistive at 240 Vac / 30 Vdc, 1/2 hp at 120/240 Vac (NO), 1/3 hp at 120/240 Vac (NC)
Mechanical life 10,000,000 operations
Electrical life 100,000 operations
Temperature –20 °F to +150 °F (–28 ° to 65 °C)
Transient protection 10,000 volts for 20 microseconds
Indicator LEDs 2 LEDs marked LOAD A and LOAD B
Optional selector switch settings ALTERNATE, LOCK LOAD A, LOCK LOAD B
Load A: Pin 2
Load B: Pin 8
1
4
Input
Voltage
Control
Switch
L2
L1
3
6
2
7
8
5
1
Load A: Pins 3 or 11
Load B: Pins 1 or 9
L2L1
11
Input
Voltage
Control
Switch
48
39
6
210
75
L1
SPDT
Control
Switch
O/L
O/L
1
2
8
3
4
5
L2
M1
M2
D852X Series Relays,
DPDT Cross-Wired
D853 Series Relays,
Three-Switch Applications
Typical Installations for SPDT and DPDT Alternating Relays,
Anti-Bounce Installation
When the control switch
opens, the second load (M2)
is turned off, the alternating
relay toggles back to the
LOAD A position, and the
process can be repeated
again. On relays with DPDT
contacts, two pilot lights can
be used for remote indication
of LOAD A or LOAD B status.
To eliminate any bounce
condition of the control
switch, the addition of a
second switch (OFF) along
with two auxiliary contacts is
recommended as shown in
the Anti-Bounce Installation.
1
Lead
Lag
Load
B
Load
A
L1 L2
8
Input
Voltage
4
36
27
5
1
Lead
Lag
Load
B
Load
A
L1 L2
Stop
8
Input Voltage
4
36
27
5
SPDT
Control
Switch
L1
1
2
3
4
5
Off
M1
M1
M2
L2
M2
8