Sizing the panel slot for this S2 frame
The 3RT2336-1AL20 is a SIRIUS-branded contactor in the S2 frame size, 75 mm wide by 114 mm tall by 130 mm deep — the depth is the dimension that often surprises when fitting into shallow enclosures or alongside busbar trunking.
Auxiliary contact ratings — what the voltage columns mean
At 690 V the auxiliary contacts are rated 1 A, and at 500 V they handle 2 A — these are the figures for the higher-voltage control schemes sometimes found in 690 V distribution panels.
Typical mechanical life is 10,000,000 operations — this is the contactor frame's endurance before mechanical wear, not the electrical life under load, which will be lower depending on the switched current and duty cycle.