Emerson
™
SureSwitch
Contactor Upgrade
™
Universal
U
49P11-843
Universal Electronic Replacement
for Mechanical Compressor Contactors
+
Contactor
• Short- Cycle Timer
• Brownout Protection
• Long-Life Sealed Switch
=
L
1
LINE
Benefits
•5x contactor life
•Totally sealed switch to keep out ants and debris
•Microprocessor control nearly eliminates contact welding and pitting
•Ideal install with new Preventative Maintenance contracts
•Compressor is protected from brownouts and short cycling
•Save on pest control treatments
R
LOAD
L
2
Y
C
C
5-Year Limited Warranty
For up to 5 Ton/40 FLA applications
LONG
IFE
PROTEC
-L
AC
PEACE
OF
M
IN
D
N
TIO
FOR
Emerson
™
SureSwitch
Contactor Upgrade
™
Features
•Microprocessor controlled sealed compressor switching
•Line voltage brownout protection
•Short cycle protection
•Tricolor LED displays
•Heavy-duty lug connectors
•Zero chatter latching relay
•Four-hole mounting matches mechanical contactors
•Random start delay on power up and brownout recovery
•Compressor test and cycle count by pushbutton
49P11-843
Universal Electronic Replacement
for Mechanical Compressor Contactors
Performance Tested
21M51U-843
The sealed SureSwitch has underwent exhaustive testing on
Copeland 5-ton scroll compressors to demonstrate ultimate
reliability. This technology has been utilized on OEM controls
since 2006 and is now available for the Aftermarket.
5x Contactor Life
Microprocessor
controlled switching
algorithms reduce
arcing, virtually
eliminating contact
pitting and welding.
Contacts after one million cycle testing.
Terminal Designations
24 V
Y
C
Compressor
208/240 V
C
R
L1
Line
L2
Fan C Hard
Accessories
Cap
CCH
LED Flash Codes
Slow
Green
Solid
Green
Fast
Green
Green / Red
Green / Yellow / Red
Standby
Normal
Delay
Low Line Volt.
Test
1/4" Spades
Lugs
1/4" Spades
Specifications
Electrical Ratings
Line Voltage Input ...................... 208/240 VAC, 50/60 Hz
Full Load Amperes (FLA) ........................................... 40A
Locked Rotor Amperes (LRA) .................................. 200A
Control (Coil) Voltage (Y, C)................. 24 VAC, 50/60 Hz
Recommended Terminal Torque – C, R, L1 and L2
#4 – 6 AWG ....................................................... 45 in-lbs
#8 AWG............................................................. 40 in-lbs
#10 – 14 AWG ................................................... 35 in-lbs
24 VAC (Y, C) Terminals are
¼"
Male QC’s accepting #12-24 AWG wire
Dimensions
2-3/4" W x 2-3/8" H x 3-7/8" L
Operating Temperature Range
-40° to 158° F (-40° to 70° C)
Humidity Range
5 to 95% relative Humidity (non-condensing)
For Additional Information
EmersonSureSwitch.com
Scan QR Code or visit us at www.white-rodgers.com
SureSwitch requires line voltage for operation and testing
Timings
Anti-Short-Cycle Delay.....0s or 180s (selectable) at 60 Hz
0s or 216s (selectable) at 50 Hz
Compressor Test ........................................... 5s at 60 Hz
6s at 50 Hz
Saint Louis, Missouri
314-553-3600
Markham, Ontario
905-948-3411
The Emerson logo is a trademark and
a service mark of Emerson Electric Co.
www.white-rodgers.com
www.emersonsureswitch.com
WR-5976-5
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