The 3RT1056-2XF46-0LA2 is a Siemens SIRIUS contactor in the S6 frame size, meaning it's built for higher-current motor switching in a compact footprint — the S6 frame typically handles currents in the 150–300 A range at 400 V AC-3, though the exact rating depends on the coil variant and duty cycle. The 110 VDC coil pulls in with a 0.7 initial value factor — that's the minimum voltage at which the magnet system reliably closes, so if your DC bus sags below ~77 V during startup, this contactor may chatter or fail to pull in. Screw fixing means it bolts directly to a mounting plate — no DIN rail adapter.
Physical envelope and clearance
The body measures 170 mm deep, 120 mm wide, 172 mm high — that's a substantial cube, so check your gland plate clearance and door swing before committing the panel layout. The forward clearance is the tightest — 20 mm means the arc chute needs breathing room, not just wire bending space. Mounting holes: one hole per fixing point, 9 mm diameter — M8 bolts fit directly.
Switching frequency by duty class
Maximum switching rates vary significantly by duty: AC-1 (resistive) allows 800 operations/hour, AC-3 (squirrel-cage motor start/run) allows 750 ops/h, AC-4 (plugging/inching) drops to 130 ops/h. For DC loads: DC-1 allows 400 ops/h, DC-3 and DC-5 both allow 350 ops/h. In a 110 VDC circuit with inductive load, that arc time determines the contact erosion rate and the minimum load current for reliable arc transfer. Mechanical endurance is 10 million operations typical — that's the unloaded life; electrical life under full load will be lower, governed by the switching frequency and the make/break current.
Auxiliary contact capacity and wire range
The contactor includes an auxiliary switch block. These are the DC-13 switching ratings — inductive load, so derate further for solenoid or relay coils.
Temperature limits and storage
Operating ambient: -40 to +70 °C — that covers most outdoor cabinet installations in temperate climates.
Sourced to order against the BOM quantity through independent distribution.