The Schneider Electric TeSys WB1KB155 is a low-consumption contactor coil designed for the TeSys range of contactors. It operates on a 47...51 V DC control circuit, drawing an inrush power of 380...520 W and holding in at just 0.15...0.2 W. The sealed operating time is 25 ms, and it is rated for 1,200,000 mechanical cycles at a maximum operating rate of 120 cycles per minute at 131 °F (55 °C).
The 47...51 V DC control voltage is a narrow band — verify your control supply sits within that range, not just nominally 48 V. The low-consumption design (0.15...0.2 W hold-in) means minimal heat dissipation in the panel, but the inrush spike at 380...520 W still needs a power supply that can deliver that transient without droop. The 25 ms sealed operating time is typical for a contactor coil; it governs how fast the main contacts close, which matters for sequence timing in a motor starter.