THERMISTOR PRODUCTS PTC THERMISTOR FOR MOTOR STARTER PTH7M/491 Series The PTH7M/491 Series is specifically designed for appliance application in refrigerators, air conditioners and freezers and feature an encapsulated construction and "quick connect" terminations to facilitate installation and service. The exceptionally low resistance of this Posistor(R) in the off condition allows a maximum current to flow in the starting winding. As the temperature of the Posistor(R) increases, so does its resistance. The starting winding is essentially isolated from the running winding once the motor has reached operating speed because of this increase in Posistor (R) resistance. FEATURES No starting contacts to pit or wear May be directly substituted for start switches without redesigning motor Encapsulated construction Acoustically and electrically noise free Vibration and shock resistant Long operating life Ideal for explosion proof motor applications Quick connect terminations PART NUMBERING SYSTEM PTH7M PTH7M SERIES 4R7 M RESISTANCE VALUE B3 PTH491 A RESISTANCE TOLERANCE M: 20% STARTING SYSTEM B3: CSR C1: RSIR C2: RSIR D2: RSCR D3: RSCR PTH491 STARTING SERIES SYSTEM A: CSR B: CSIR C: RSIR 01 AR 3R3 N 160 OTHER CURIE RESISTANCE SPECIFICATION POINT VALUE AR: 120C AS: 135C RESISTANCE TOLERANCE M: 20% N: 30% MAX. VOLTAGE 160: 160V 300: 300V DIMENSIONS: mm PTH7M4R7MB3 PTH491A01AR3R3N160 2.5 9 6.5 4 4 22 19 5 23 11.66 8 15 16.5 19.5 1.5 5 19 1.5 20 28 39 40.5 33 2.5 4.5 24.5 15 4.5 8 1 1 8 4.7 31 11 SPECIFICATIONS Resistance Voltage Value (Ohms) max. (V) at 25C PTH7M Series Fail-Safe Backup Function PTH7M4R7MB3 PTH7M4R7MC1 PTH7M4R7MC2 4.7 20% 180 PTH7M4R7MD2 PTH7M4R7MD3 PTH7M6R8MB3 PTH7M6R8MC1 PTH7M6R8MC2 6.8 20% 200 PTH7M6R8MD2 PTH7M6R8MD3 PTH7M100MB3 PTH7M100MC1 PTH7M100MC2 10 20% 225 PTH7M100MD2 PTH7M100MD3 PTH7M330MB3 33 20% 355 PTH7M330MC1 Part Number Current max. (A) Starting System CSR RSIR 12 RSCR CSR RSIR 10 RSCR CSR RSIR 9 RSCR CSR RSIR 6 Part Number PTH7M330MC2 PTH7M330MD2 PTH7M330MD3 PTH491 Series PTH491A01AR3R3N160 PTH491A01AR4R7N180 PTH491A01AR6R8N200 PTH491A04AR6R8N225 PTH491A01AR100N225 PTH491A04AR100N315 PTH491A01AR150N250 PTH491A04AR150N355 PTH491A01AR220N300 PTH491A04AR220N400 PTH491A01AR330N355 PTH491A04AR330N450 PTH491A01AR470N400 PTH491A04AR470N500 Resistance Value (Ohms) at 25C Voltage max. (V) Current max. (A) 33 20% 355 6 3.3 30% 4.7 30% 160 180 200 Starting System RSIR 6.8 30% 225 10 30% 15 30% 22 30% 33 30% 47 30% 315 250 355 300 400 355 450 400 500 RSCR 12 10 13 9 12 8 10 7 9 6 8 5 7 -- *Tab terminal size: PTH7M - No. 250; PTH491A-No. 250; PTH491B- No. 187 STARTING SYSTEMS OF MOTORS Type PTH491A01 PTH7M-B3 Starting PTH491B01 Capacitor Start Induction Run Capacitor Start and Capacitor Run Resistance Start Induction Run Permanent Split Capacitor PTH491A, B: Discrete type 560 APPLICATION CIRCUITS PTH7M-C1 PTH7M-C2 PTH7M-D2 PTH7M-D3 CSIR Motor CSR Motor RSIR Motor RSCR Motor PTH7M, B, C, D: Plug-in type (2-receptacle type) PTH491: Optional product, not recommended for new design CG01-J Rev.1