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Emerson 49M11-843 SureSwitch™ Multi-Volt Universal Contactor

Save 56%
Original price $128.90
Current price $56.39
SKU 49M11-843
Currently 80 in stock.

Emerson 49M11-843 SureSwitch™ Multi-Volt Universal Contactor

SureSwitch™ is an electronically-controlled relay that can be used to replace single and two-pole contactors commonly used in air conditioners, heat pumps and other applications. A patented switching algorithm reduces arcing between contacts, which nearly eliminates pitting and welding for a longer life. The switching mechanism is sealed to prevent intrusion from insects and other debris.

SureSwitch is similar to a 1 1 /2 pole contactor, in that L1 only the compressor terminal T1(C) is switched. The compressor terminal T2(R) is connected by a shorting bar to line input L2, and is energized even when a call is not present.

  • Multi-volt coil works with all common coil voltages
  • 5x traditional contactor life
  • Totally sealed switch keeps out ants, pests and debris
  • Microprocessor control inhibits arcing that cause welding and pitting
  • Line voltage brownout protection and short cycle timer provide compressor protection
  • Zero chatter latching relay
  • Heavy-duty lug connectors
  • 5-year limited warranty
  • Four-hole mounting matches mechanical contactors
  • Tri-color LED with compressor test and cycle count by pushbutton


Data Sheet

Installation Instructions



Input Line Voltage: 120/208/240 Vac, 50/60 Hz
Control (Coil) Voltage: 24 Vac, 50/60 Hz, 120/208/240 Vac, 50/60 Hz
Locked Rotor Amperes: 200A
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
Operating Temperature Range: -40° to 158°F (-40 to 70°C)
Humidity Range: 5 to 95% relative Humidity (non-condensing)
Dimensions: 2.75" W X 2.38" H X 3.88" L