Datasheet
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34980A general-purpose switch modules
The 34980A general-purpose switches can be used to route signals or to control other system devices.
These switches are ideal for device actuation and switching loads or power supplies.
Choose from the following features:
• Form C channels up to 1 A, 50 W
• Form A channels up to 5 A, 150 W
• Armature latching relays
• Simultaneous channel switching
• Temperature sensor to detect overheating conditions
• Connections via standard 50 or 78-pin Dsub cables or detachable terminal block
The 34937A is the most versatile general purpose switch with 28 Form C channels that can switch up to 1
A of current. In addition, this module has four Form A channels that can switch up to 5 A of current. For
power switching applications, the 34938A has 20 5-amp channels in a Form A topology. Each Form A
general-purpose switch can handle up to 150 W, enough for many power line switching applications. For
high density applications the 34939A offers 64 Form A channels for switching up to 1A and carry currents
up to 2A.
The general purpose switches contain latching armature relays where multiple channels can be closed at
the same time. Additionally, for switching reactive loads, the optional terminal blocks have pads for
snubbing circuits.
The built-in relay counter helps predict when relays need to be replaced.
Figure 7:34937A 32-channel Form A / Form C
General purpose switch modules
34967A
34938A
34939A
Channels/configurations
28 Form C
4 Form A
20 Form A
64 Form A
Switch Type
Armature, latching
Armature, latching
Armature, latching
Input characteristics (per channel)
Max volts (DC, AC RMS)
1
Form C – 300 V
Form A – 30 VDC/250
VAC
30 VDC/250 VAC
+
/
-
100
V
pea
k
Max current (DC, AC RMS)
Form C – 1 A (2 A carry)
Form A – 5 A switch
(8 A carry)
5 A switch
(8 A carry)
1 A switch
(2 A carry)
Power (W, VA)
2
Form C – 60 W
Form A – 150 W
150 W
60 W
Volt-Hertz limit
10
8
10
8
10
8
General specifications
Offset voltage
3µV
3µV
3µV
Initial closed channel resistance
Form C – 125 mΩ
Form A – 50 mΩ
< 60 mΩ
<125 mΩ
CD isolation (ch-ch, ch-earth)
> 10 GΩ
> 10 GΩ
10 GΩ