Mod-Tronic is a Canadian based distributor of slow and high speed switches from Dynalco Controls. The SW-100 speed switch has a single setpoint for overspeed and underspeed protection, and is DIN rail mountable. The SWT-1000 and SWTD-1000 have a single relay setpoint for over speed protection and 4-20mA isolated output. The SWT-2000 two channel speed switch/transmitter acts as two speed switches in one as it can protect two separate machines at once. Four other models are available as well.