HFW4A1201J00 is an HFW4A type electromechanical relay designed for reliable switching applications. It features a coil resistance of 520 ohms ±10% at 25°C with a nominal voltage of 18.0 VDC, must operate voltage of 9.5 VDC, and must release voltage of 0.95 VDC. The relay offers contact ratings from low level to 4A at 28 VDC resistive with a minimum of 100,000 operations. Operating over a wide temperature range of -65°C to +125°C, it withstands vibration up to 9 g's and shock up to 100 g's with 6 ms duration. With fast operate and release times of 4 ms maximum and contact bounce of 2 ms maximum, this relay is suitable for demanding aerospace, military, and industrial control applications.