MPL 9370 Series switches offer pressure, vacuum and differential models capable of sensing very low setpoints, and switching current up to 5A resistive, 2.5A inductive. Designed for use in the HVAC industry, where reliable air proving is critical to both performance and customer safety, the MPL 9370 is a favorite with leading manufacturers of gas-fired warm air furnaces and water heaters.
 
Smaller and lighter than any other HVAC pressure switch, the MPL 9370 is built for the same temperature range and operating life as conventional switches made of stamped steel.
 
The MPL 9370 will perform equally well in other applications which demand low OEM unit cost, robust design, setpoint accuracy, and high reliability.
 

The MPL 9370 features a unique integral snap switch, with positive snap action and self-wiping silver contacts for ultra-reliable switching. The molded silicone diaphragm converts very low pressure or vacuum into movement of an actuator disk, which operates the silver alloy contacts.
 
Contact force in the switch, a key to reliable switching, is higher than in a conventional HVAC pressure switch. Standard pressure connection is a mutli-barbed port. Custom ports, mounting and other options are available. Because the MPL 9370 is round, and the ports and switch cover are fixed to the body by ultrasonic welding, OEM designers can often specify a desired orientation between the port, bracket and terminals.
 
Specifications
  Body: glass-filled polyester, grade SEO
  Diaphragm: post-cured silicone rubber
  Terminals: 0.032" x 0.250" copper alloy
  Contacts [9370]: fine silver alloy, point-and-dome
  Contacts [9371]: gold-platinum-silver alloy, crossbar
  Actuator: stainless steel
  Springs: stainless steel, phosphor bronze
  Operating Temperature: -40 to +85C (-40 to +185F)
  Pressure:
  Operating: 0.15 in/H 2 O to 34 in/H 2 O
  Proof: 100 in/H 2 O (3.6 psi)
  Burst: 5 psi minimum
  Form: SPDT
  Resistance: Initial: <50 milliohms
 
Electrical
The MPL 9370 (fine silver contacts) is designed for application between 100mA minimum and 5A (resistive) maximum. MPL 9371 (gold-platinum-silver alloy) is designed for low-current control circuits, with loads between 15mA minimum and 0.5A maximum.
 
The MPL 9370 and MPL 9371 have been subjected to rigorous life cycle and environmental testing, and are recognized by UL and CSA for application under Standard 353, Pilot Duty and Standard 508, Industrial Control.
 
Mounting Options
The MPL 9370 can be mounted with diaprhagm perpendicular or parallel to level, as required by application (Orientation must be included in user specifications. Perpendicular mounting recommended.) Standard mounting brackets are lightweight metal with unique features for flexible orientation of pressure port.