The Schneider Electric LX4FG170 is a replacement contactor coil in the TeSys F range, designed for 170 V DC control circuits. It's the service part you order when a TeSys F contactor's coil fails on a 170 V DC line — common in machine tool cabinets where a separate DC supply powers the holding circuit. The coil pulls in with an 800 W inrush at 20 °C, then holds at 5 W once the armature seats.
Timing and duty cycle constraints
Closing time is 30 to 40 ms; opening takes 30 to 50 ms. That's fast enough for most motor starting and interlocking sequences, but if your safety circuit demands a faster drop-out, you'll need to check the opening time against your PL/SIL requirement. Maximum operating rate is 60 cycles per hour at 55 °C — fine for a pump or conveyor contactor that cycles a few times an hour, not for a rapid-reversing application.
Coil voltage tolerance and suppressor note
The coil holds in across 0.85 to 1.1 times Uc (144.5 to 187 V DC) at 55 °C, and drops out between 0.15 and 0.2 Uc (25.5 to 34 V DC). That wide drop-out band means the contactor releases reliably even with a sagging DC bus. This coil ships without a built-in suppressor module — you'll need to add a free-wheeling diode or varistor across the coil terminals if your PLC output or relay driving it doesn't have internal suppression. The inductance of the closed circuit is 9.3 H, so the flyback voltage on an unsuppressed coil can arc across a relay contact.