Siemens ASC77.2U 用户手册

 

Document No. 129-420 

December 13, 2004

 

 

a

b

c

d

e

f

g

EA1

175R1

 

a.  External dual auxiliary switch 

b. Position 

indicator 

c.  GCA/GBB/GIB position adapter 

d.  GMA/GEB position adapter 

e.  3 mm hex key 

f.  Plastic mounting adapter inserts (2) 

g.  Threaded M5 × 25 screws (2) 

 

 

The OpenAir External Auxiliary Switch (EAS) provides 
switch functionality for standard model damper actuators 
with easy installation for in-service units. 

ASC77.2U 

Dual Auxiliary Switches 

24 Vac to 250 Vac 
AC 6A resistive 

AC rating 

AC 2 FLA, 12 LRA 
12 Vdc to 30 Vdc 

DC rating 

DC 2A 

Insulation system 

Double insulated 
 

Switch range 
 Switch 

A 

0° to 90° with 5° intervals 

 Recommended 

 

 usage 

0° to 45° 

  Switch B 

0° to 90° with 5° intervals 

 Recommended 
 usage 

45° to 90° 

Switching hysteresis 

2° 
UL listed to UL 873 
cUL certified to Canadian 
Standard C22.2  
No. 24-93 
Electromagnetic 
compatibility 89/336/EEC 

Agency certification 

Low voltage directive 
73/23/EEC 

Conduit Connection 

Threaded 1/2-inch 
NSPT, flex only 

Shipping Weight 

1.1 lb (0.48 kg) 

Personal injury/loss of life 
may occur if you do not follow 
the procedures as specified. 

Equipment damage, or loss of 
data may occur if you do not 
follow the procedures as 
specified. 

Phillips screwdrivers 
No. 2 for screws, No. 1 for adjustment 

15 minutes 

CAUTION:   

Remove power from in-service damper 
actuator before installing external 
auxiliary switch. 

 

WARNING: 

Do not open the external auxiliary switch. 

EA1

191R1

 

Item Number 129-420, Rev. 010