Digital guide
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Kollmorgen TTRB2-2953-311
Product Name: Motor Thermostat / Thermal Switch Assembly (Kollmorgen legacy accessory)
Family: Thermal protection accessories for B/M/Goldline motors
Introduction: Normally-closed bimetal thermostat or PTC assembly inserted in motor winding slot; trips on overtemperature.
Detailed content
Technical Specifications:
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Type: TTRB2 series thermal relay/bimetal switch
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Trip temp: typically 145–155 °C (class F/H)
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Voltage rating: 250 VAC max on contact
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Current: 1–2 A signal level (not power switching)
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Leads: 311 = 3-wire, 1 ft leads with spade or M8 ring
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Mount: epoxy-potted into stator slot
Function: Opens drive enable circuit or alerts PLC when motor overheats.
Materials: Phenolic carrier, silver contacts, PTFE leads.
Application: Retrofit thermal protection for B-204/B-202 series lacking built-in thermostat.
Notes: Not a drive or motor; verify NC/NO state and trip curve against motor insulation class.
