Mains and UPS disconection

[Designmen90]

Hello everyone,
here I have some problem with schematics (schematic attached). The SK_2 is circuit for disconecting main lines and UPS. So, I guess that S2 is a muschroom on switchboard's door, which will disconnect the Q1 circuit breaker. But, what should be K1 (24VDC). Is this relay used for UPS disconnection? How is this connected?

 

[Spoon]

S2 is a 'latching mushroom, turn to release' pushbutton. It shows no wires going to it. K1 also shows no wired going to it.
There also doesn't seem to be a shunt trip for Q1 so I don't know how S1 will disconnect Q1.
Its hard to understand the pic of the schematic.
Is there a K1 contact anywhere in the sheets?

 

[Designmen90]

No, there is nowhere K1 contact, on next page is just AC/DC converter, 24V

 

[Designmen90]

I suppose that this K1 is supplied via AC/DC converter and if we press the mushroom we will disconnect Q1 via shunt release and because AC/DC converter will stay without voltage the contact of K1 relay will change NO/NC state and sent signal to UPS, and finaly disconnect UPS. So, with muschroom, UPS and mains will be disconnected. But, I'm not sure. Does anyone have some other idea?