What This Part Is and What It Does
This SENTRON 3VA1163-1AA36-0JH0 is a 3-pole switch disconnector in the 3VA1 IEC frame 160 family — built in an MCCB form factor but intentionally without overload or short-circuit protection. It's a load-break disconnect rated for 63 A continuously from 40 °C all the way up to 70 °C ambient, meaning that thermal derating doesn't start until you push past that 70 °C mark. That's unusual for a molded-case-style device; most MCCBs start shedding current at 40 °C. Here it holds flat. The shunt trip (STL) release is rated for 110-127 V DC and AC 50/60 Hz, so it'll drop the disconnect on a remote signal from an E-stop or safety relay. It also carries 2 auxiliary switches HQ and 1 trip alarm switch HQ — three CO contacts total for status feedback back to a PLC or annunciator panel.
Where It Goes in a Panel
This is a front-terminal clamp connection, so you land the main circuit conductors on the front face — no rear-connect bus bar required. The dimensions are 70 mm deep, 76.2 mm wide (that's 3 inches exactly), and 130 mm tall. It's a 3-pole unit that mounts on a DIN rail or panel plate; the IP40 front face means it's fine inside a general-purpose enclosure but not for washdown zones. Power loss at full load is 38 W maximum. That's not trivial — if you're packing several of these in a small enclosure, you'll want to account for the heat rise. The operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Mechanical service life is 15,000 operating cycles typical, so it's built for frequent switching in a disconnect role, not just infrequent isolation.
What the Ratings Mean for Your Choice
The 63 A rating holds flat across the entire 40 °C to 70 °C ambient range — that's the headline takeaway. If your panel runs hot near a motor drive or a furnace wall, this disconnect won't force you to oversize the frame just to hold rating. The insulation voltage is rated 800 V, operating voltage 690 V AC and 500 V DC, so it covers 480 V and 600 V class systems with margin. The shunt trip is the main reason you'd pick this variant over a plain disconnect. It's a 110-127 V coil, so it works on common control voltages in North America (120 V) and Europe (110 V) without a transformer tap. No undervoltage release on this unit — if you need UVR, that's a different order code.