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Tamperproof (Pre-set) Thermostat FTO 011
NC/ opens on temperature rise (red module housing) - for regulating heaters or for switching signal devices when temperature has fallen below the minimum value.
Tamperproof (Pre-set) Thermostat FTS 011
NO/ closes on temperature rise (blue module housing) - for regulating filter fans, heat exchangers, cooling devices or for switching signal devices when temperature limit has been exceeded.