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MPL 9300 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 9300 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 9300 is built for the same temperature range and operating life as conventional switches made of stamped steel.
The MPL 9300 will perform equally well in other applications which demand low OEM unit cost, robust design, setpoint accuracy, and high reliability.
The MPL 9300 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 9300 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.
Body: glass-filled polyester, grade SEO
Diaphragm: post-cured silicone rubber
Terminals: 0.032" x 0.250" copper alloy
Contacts: silver alloy, beryllium copper
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
The MPL 9300 is designed for appliance markets in which typical loads are 2.5 Amps inductive, 5 Amps resistive. The silver alloy contacts provide low contact resistance during dry circuit conditions, as well as long life and reliability.
MPL 9300 has been subjected to rigorous life cycle and environment testing, and is recognized by UL and CSA for application under Standard 353, Pilot Duty and Standard 508, Industrial Control.
The MPL 9300 can be mounted with the diaphragm parallel or perpendicular to level, as required by application. Standard mounting brackets are lightweight, cost-saving composite (see dimension drawings), or plated metal, when required. For optimum cost reduction, snap-in barbs are also available, (shown below) eliminating the bracket, the mounting hardware and some assembly labor. |
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