What is a Thermal Fuse and its Function? How to tell if a Thermal Cutoff has blown?
The Thermal Fuse (Thermal Cutoff, Temperature Fuse) is Axial / Radial / Organic Thermal-Link(OTCO) safety parts that stops the flow of electricity to the motor circuit when a  overheats. If the fuse is missing or broken, your motor will not start.
A thermal fuse fails when the exhaust temperature exceeds the Thermal fuse rating, that is when the temperature rises above the Set temperature that the fuse is designed to handle.
This can Circuit break occur when a heating element is shorted, a regulating thermostat or thermister fails, or with a partially restricted exhaust vent.
The Thermal Fuse attaches to the blower wheel housing. It must be replaced when there is no longer continuity between the terminals. This is a one-time Thermal Fuse, meaning it cannot be re-set. The replacement part features Same current and temperature characteristics.

Current characteristics
SD&TD series: 10A/15A
PD&QD series: 20A/25A
TS series: 100A

PD&QD series

Dimensions(mm) Series A B C D E* F* PD/QD 10.7±0.5 11.8±0.5 4.8±0.2 1.6±0.05 50±5 6.6±0.5

 

Model NO.	Tf (℃)	Fuse-Temp(℃)	TH(℃)	TM (℃)	Ir (A)	Ur (V)	RoHS
PD102	102	98±2	66	160	20	125DC	▲
PD115	115	111±2	82				▲
PD125	125	121±2	90				▲
PD130	130	125±2	97				▲
PD136	136	131±2	102				▲
PD150	150	145±2	117				▲
QD102	102	98±2	66	160	25	125DC	▲
QD115	115	111±2	82				▲
QD125	125	121±2	90				▲
QD130	130	125±2	97				▲
QD136	136	131±2	102				▲
QD150	150	145±2	117				▲

 
 PD&QD series

Dimensions(mm) Series A B C D E* F* PD/QD 10.7±0.5 11.8±0.5 4.8±0.2 1.6±0.05 50±5 6.6±0.5

 

Model NO.	Tf (℃)	Fuse-Temp(℃)	TH(℃)	TM (℃)	Ir (A)	Ur (V)	RoHS
PD102	102	98±2	66	160	20	125DC	▲
PD115	115	111±2	82				▲
PD125	125	121±2	90				▲
PD130	130	125±2	97				▲
PD136	136	131±2	102				▲
PD150	150	145±2	117				▲
QD102	102	98±2	66	160	25	125DC	▲
QD115	115	111±2	82				▲
QD125	125	121±2	90				▲
QD130	130	125±2	97				▲
QD136	136	131±2	102				▲
QD150	150	145±2	117				▲

 
 
TS series

Dimensions(mm)

 

Model	Tf (℃)	Fuse-Temp (℃)	TH (℃)	TM (℃)	*Imax 8/20us (1 time)	Ir (A)	Ur (V)	RoHS
TS102	102	99±2	61	180	100KA	80	250(AC)	▲
						100	125(AC)	▲
						100	100(DC)	▲
TS115	115	112±2	74	180	100KA	80	250(AC)	▲
						100	125(AC)	▲
						100	100(DC)	▲
TS123	123	118±2	82	180	100KA	80	250(AC)	▲
						100	125(AC)	▲
						100	100(DC)	▲
TS125	125	122±2	84	180	100KA	80	250(AC)	▲
						100	125(AC)	▲
						100	100(DC)	▲
TS130	130	126±2	88	180	100KA	80	250(AC)	▲
						100	125(AC)	▲
						100	100(DC)	▲
TS136	136	132±2	94	180	100KA	80	250(AC)	▲
						100	125(AC)	▲
						100	100(DC)	▲
TS150	150	146±2	108	180	100KA	80	250(AC)	▲
						100	125(AC)	▲
						100	100(DC)	▲

 

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