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Series 21 Series 24 Ammeter switch Series 25 Series 28 Series 31B Series 31 Single-Hole mount W2
Series 21 Series 24 Series 25 Series 28 Series 31 Series 31A Type W-2
Mechanical Specifications
Sections 1-30 1-15 1-25 1-15 1-10 1-10 1-8
Poles 1-60 1-30 1-75 1-30 1-20 1-20 1-48
Positions 2-8 2-8 2-12 2-16 2-8 2-8 2-12
Detent angle 45° 45° 30° 22.5° 45° 45° 30°
Electrical ratings
Continuous rating 15A-600V 30A-600V 10A-600V 5A-600V 15A-600V 15A-600V 20A-600V
Interrupting current
120VAC
240VAC
24VDC
600VAC
125VDC
250VDC
 
15A
7.5A
10A
4A
2A

 
20A
15A

6A
3A
1A
 
10A
5A
7.5A
3A


 
5A
3A

2A


 
10A
5A

3A
1A

 
10A
5A

3A
1A

 
30 (110VAC)
20A

8A
5A
1.65A
Max. breaking ability 30A 75A 15A
Max. making ability 30A 95A 75A 15A 45A 45A
Momentary current
30 seconds
60 seconds
3 seconds
 
35A
35A
140A
 
75A
60A
200A
 
30A
25A
75A
 



 
35A
25A
90A
 
35A
25A
90A
 



Overload current
120VAC
240VAC
600VAC
24VDC
125VDC
 
30A




 
95A
65A
35A


 
75A
20A



 
15A




 
60A
45A
20A
30A
15A
 
60A
45A
20A
30A
15A
 





Dielectric strength 2200Vrms 2200Vrms 2200Vrms 2200Vrms 2200Vrms 2200Vrms 2200Vrms
Insulation resistance 100 megaohms 100 megaohms 100 megaohms 100 megaohms 100 megaohms 100 megaohms
Contact resistance 10 miliohms 10 miliohms 10 miliohms 10 miliohms 10 miliohms 10 miliohms 10 miliohms
Horsepower Ratings  
 
 
 
 
 
 
Other
Switch mountings
Single Hole
2-Hole
3-Hole
4-hole
Waterproof Mount
Module
 



Yes
Yes

 


Yes

Yes

 



Yes
Yes

 



Yes
Yes

 



Yes
Yes
Yes
 
Yes



Yes

 

Yes




Locking features
Key Lock Handle
Solenoid Lock
Key Operated
Pull-To-Lock
Key-Interlock
Pull-To-Turn
Pull-To-Disable
 

Yes



Yes

 
Yes


Yes
Yes


 

Yes



Yes

 
Yes






 


Yes




 


Yes




 



Yes
Yes
Yes
Yes
Optional features
Solenoid Operated
Ganged Gear Operated
Spring Return
 

Yes
Yes
 

Yes
Yes
 

Yes
Yes
 
Yes

Yes
 


Yes
 


Yes
 


Yes
Approvals
UL Recognized
CSA Certified
CE
 
Yes
Yes

 
Yes
Yes
Yes
 
Yes
Yes

 
Yes
Yes

 
Yes


 
Yes


 
Yes


Display Output
Display Range (Indication)
Meter Power Supply (Aux)
Output Options
Voltage to Measure (Input)