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Technical Documents
Technical Documents
Product Details
Product Details
A.49 OVERLOAD RELAY
Thermal Unit, Type S, Type A, melting alloy, Class 20
Thermal units are intended to protect motors, controllers, and branch circuit conductors against excessive heating due to prolonged motor over currents up to and including locked rotor currents. Protection of the motor and the other branch circuit components from higher currents, due to short circuits or grounds, is a function of the branch circuit fuses or circuit breakers. Class 20 thermal units respond to overload current conditions according to trip curves. These thermal units will trip in 20 seconds or less on overload conditions. The proper thermal unit is selected using the motor full load current and a selection table. These thermal units have a one piece construction. The motor current passes through a small heater winding within these thermal units. Under overload conditions, the heat causes a special solder to melt allowing a ratchet wheel to spin free thus opening the control circuit contacts and opening the motor contacts.
Thermal Unit, Type S, Type A, melting alloy, Class 20
Thermal units are intended to protect motors, controllers, and branch circuit conductors against excessive heating due to prolonged motor over currents up to and including locked rotor currents. Protection of the motor and the other branch circuit components from higher currents, due to short circuits or grounds, is a function of the branch circuit fuses or circuit breakers. Class 20 thermal units respond to overload current conditions according to trip curves. These thermal units will trip in 20 seconds or less on overload conditions. The proper thermal unit is selected using the motor full load current and a selection table. These thermal units have a one piece construction. The motor current passes through a small heater winding within these thermal units. Under overload conditions, the heat causes a special solder to melt allowing a ratchet wheel to spin free thus opening the control circuit contacts and opening the motor contacts.
Technical Specifications
Technical Specifications
NEMA Eutectic Alloy Overload Relays | |
| Pkg Weight UOM | LB |
|---|---|
| Mfr UNSPSC | 39121500 |
| Mounting | PLUG IN |
| Pkg Length | 1.7 |
| Pkg Qty | 1 |
| Pkg Weight | .04 |
| Mfrcode | SQD |
| Mfr Fullname | SQUARE D/TELEMECANIQUE |
| Trip Type | CLASS 20, STANDARD |
| Catalog Number | A.49 |
| Motor Fla | 0.43 TO 0.47 AMPERE (1 THERMAL UNIT), 0.41 TO 0.45 AMPERE (2 THERMAL UNIT), 0.4 TO 0.41 AMPERE (3 THERMAL UNIT) |
| Pkg UOM | EA |
| Product Name | THERMAL UNIT |
| Pkg Width | 2.6 |
|---|---|
| Pkg Height | 3.7 |
| Used On | AC/DC MAGNETIC STARTER, MANUAL STARTER, SEPARATELY MOUNTED OVERLOAD RELAY |
| Pkg Type | PK |
| China Rohs Regulation | Product out of China RoHS scope. Substance declaration for your information |
| Packaging Made With Recycled Cardboard | No |
| Range Of Product | A |
| Eu Rohs Directive | Not applicable, out of EU RoHS legal scope |
| Packaging Without Single Use Plastic | No |
| Take-Back | No |
| Country of Origin | Mexico |
| Thermal Overload Type | melting alloy |
| Motor Tripping Class | 20 |