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| PartNumber | 521B | 521BA | 521BTAACH |
| Description | SMOKE DETECTOR WITH BASE 2 WIRE, Detector Type:-, Supply Voltage:-, Operating Temperature Min:0°C, Operating Temperature Max:37°C, Product Range:-, Colour:White | ||
| Manufacturer | Winchester Electronics | - | ST |
| Product Category | Coaxial Connectors (RF) | - | IC Chips |
| Series | - | - | |
| Packaging | - | - | - |
| Impedance | - | - | - |
| Mounting Type | - | - | - |
| Features | - | - | - |
| Ingress Protection | - | - | - |
| Frequency Max | - | - | - |
| Connector Type | - | - | - |
| Contact Termination | - | - | - |
| Connector Style | - | - | - |
| Fastening Type | - | - | - |
| Housing Color | - | - | - |
| Cable Group | - | - | - |
| Shield Termination | - | - | - |