Littelfuse 350-200-2 Three-Phase Voltage/Phase MonitorLittelfuse 350 200 2 Voltage Phase Monitor Product Description The 350 is a heavy duty voltage monitor. This product should be used when high current relays or dual contacts are required, or 480V controls are used. Since the 350 uses heavy duty relays, it comes in fixed voltage range models rather than a dual autoranging version like the Model 250. The 350 200 has a 15A general purpose contact. The 350 400 provides a SPDT (Form C) relay rated to