Product Description

The MTLS-10A is a weatherproof and explosion-proof housed magnetically-actuated electric switch designed for chamber exterior mounting on a Mange-Trac or Magne-Trac Plus magnetic level indicator having a magnetic float that rides a liquid level. The MTLS-10A provides electrical current switching via two isolation single pull double throw (SPDT) normally open or normally closed contacts and is configured for double pole double throw (DPDT) operation such that two separate devices can be controlled with a single switch within the switch rating. The switch is a latching, bi-stable design that when actuated by the passing MLI float, the switch contacts remain in the actuated position until the float, traveling in the opposite direction, passes back by the switch. The switch is well suited for sending high or low level alarm signals and operating pump control relays. Switch action is break before make.

Product Features

  • Suitable for high / low level sensing
  • Directly coupled with float magnetically – no direct connection with process fluid
  • Latching, bi-stable design. Switch maintains state until return float passage in opposite direction
  • Double Pole Double Throw configuration
  • Attached directly to chamber. Easily adjustable with clamps – no additional piping required
  • Minimum Temperature Rating -40°F
  • Enclosure Classification Class 1 Div1; Groups B, C, D

Product Specifications

Switch TypeLatching, bi-stable, snap-acting magnetic cam actuated
Switch ActionBreak before make
Contact MaterialSilver-alloy, gold crosspoint
Contact ConfigurationTwo SPDT (one DPDT), normally open or normally closed
Contact RatingsAC Resistive: 10.1 amp, ¼ HP @ 125 or 250 VAC

DC Resistive: 0.5 amp @ 110 VDC, 0.25 amp @ 220 VDC

DC Inductive: 0.2 amp @ 110 VDC, 0.1 amp @ 220 VDC

Terminal Block6 position, screw clamp, 14-30 AWG
DeadbandApprox. +/- 0.500” (12.7mm) of float travel
Switch Operating TempMinimum: -40°F (-40°C)

Maximum: 248°F (120°C)

Enclosure TypeNEMA 4X, 7 & 9
Enclosure MaterialCopper-free aluminum (consult factory for other options)
Enclosure ConnectionsTop and bottom ¾” – 14 NPT female
Enclosure CertificationsEnclosure Classifications Class I & II, Divisions 1 & 2, Groups B, C, & D

Class III, Divisions 1 & 2

Compatible Products


400-11 Magne-Trac Switch Overview
Product Literature
430-01 MTLS-10A Magne-Trac IOM
IOMs, Product Literature