Mobrey Float Level Switch

Mobrey M-Switch SMA1 / SMA1/RS Float Liquid Level Switch
316SS, Side Mount, SPDT, IP66/67, 15A, 250V


Item description:
Genuine Mobrey (Solartron / Emerson) M-Switch Type SMA1 (also known as SMA1/RS) magnetic float-operated liquid level switch.
Compact, rugged horizontal side-mount design ideal for alarm signaling or as part of a pump control system.
Manufactured throughout in 316 stainless steel. The float rises and falls with liquid level and magnetically actuates a high-quality microswitch on the dry side, providing reliable voltage-free contact operation.

Key features & specifications:

Model: SMA1 / M-Switch (Mobrey ‘A’ flange mounting)
Construction: 316 stainless steel (wetside, body & end cover)
Mounting: Side mount – Mobrey ‘A’ flange
Enclosure: Weatherproof IP66 / IP67
Switch output: SPDT / SPCO (Single-Pole Change-Over)
Contact rating: 15 A 250 V AC / 0.25 A 250 V DC (gold-plated contacts – suitable for low-power circuits; not recommended for direct starting of large motors)
Maximum pressure: 19 bar 20 °C (approx. 15.4 bar 130 °C)
Operating temperature: 0 °C to +130 °C
Ambient temperature: 0 °C to +60 °C
Minimum liquid specific gravity (SG): 0.75
Switching differential: 25 mm (1 inch)
Length into tank: 153 mm (6 inches)
Float diameter: 48 mm (1.9 inches)
Maximum float swing: 112 mm (4.4 inches)
Conduit entry: M20
Typical applications: Low-level alarms in lubricating oils & fuels, pump control in header tanks, high/low alarms in condensate tanks, level alarm & pump control in storage tanks

This is a proven, simple and reliable industrial design with small in-tank dimensions – suitable where space is limited.

Ideal for industrial, marine, process, oil & gas, or plant maintenance applications where a robust stainless-steel float switch is required.