HFW4A1201G00 is an HFW-type electromechanical relay designed for reliable switching in demanding environments. It features a coil with 160 O ±10% resistance at +25°C, a nominal voltage of 12.0 VDC, must operate voltage of 6.4 VDC, and must release voltage of 0.7 VDC. The relay offers a contact rating from low level to 4A at 28 VDC with 100,000 operations life expectancy. Environmental specifications include vibration resistance from 10 CPS to 2000 CPS at 20 g's, shock resistance of 100 g's for 6 ms duration, and an operating temperature range of -65°C to +125°C. This relay is suitable for communications, instrumentation, and industrial control applications requiring robust performance under harsh conditions.