The S1-12-B is a miniature high voltage single-in-line reed relay with normally closed (Form B) contacts designed for space-constrained applications requiring high isolation. It features a 12V coil with a must-operate voltage of 9V DC and must-release voltage of 1.2V DC, along with a coil resistance of 2000O (±10%). The relay provides 1.5kV isolation voltage across contacts, supports up to 1000V DC switching voltage with a maximum switching current of 0.5A DC and carry current of 1.3A DC, and operates reliably across a temperature range of -40°C to +85°C. The single-in-line package positions coil pins near the center and contact pins at the ends for improved isolation between high voltage contacts and low voltage coil, making it ideal for high-voltage switching, control circuits, and applications where compact form factor and reliability are essential.