SIEMENS
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Siemens IC 10 · 2017
SIRIUS 3SE2, 3SE3 Foot Switches
Plastic and metal enclosures
13
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Overview
3SE29 foot switch with metal enclosure
Standard switches
The 3SE29 and 3SE39 foot switch range encompasses versions
in a metal enclosure for rugged applications as well as versions
with plastic enclosure for less harsh environments. The devices
can be supplied with or without a cover and have fixing holes for
them to be screwed to the floor.
Depending on the particular application, the metal enclosures
can be ordered with contact blocks in latching or momentary-
contact versions. The momentary-contact pedal switch in the
plastic enclosure has one microswitch (changeover contact) per
actuating pedal.
Safety foot switches
The 3SE2924-3AA20 single-pedal safety foot switches are used
on machines and plants as OK switches when operation by
hand is not possible. The switches have an interlocking function.
The safety foot switches are protected by a guard hood against
accidental operation.
Application example
The switches have two contact blocks, each with one NO con-
tact and one NC contact. The NO contacts and NC contacts of
the two contact blocks are connected for easy connection of a
single-phase motor. The normal workflow is initiated by pressing
down the pedal as far as the pressure point so that the two
NO contacts close and the motor starts to run.
If in the event of danger the pedal is pressed beyond the resis-
tance of the pressure point, the positively driven NC contacts will
open and the motor is stopped. At the same time the indepen-
dent latching takes effect and holds the NC contacts in open
position. This prevents the machine parts from continuing to run
out of control or from being restarted.
After the hazard is eliminated, the machine can only be restarted
after manually releasing the switch using a pushbutton on the
top of the enclosure. The contacts are then released again and
return to their initial position (the NO contacts are open and the
NC contacts are closed).
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Technical specifications
More information
Home page,
see www.siemens.com/sirius-commanding
Industry Mall,
see www.siemens.com/product?3SE2
Manual,
Type
3SE29
3SE39
Metal and plastic enclosures
Standards
IEC 60947-5-1
Electrical load
• At AC-15, 400 V
-
1 NO + 1 NC
A
10
--
-
2 NO + 2 NC
A
6
--
-
3SE2924-3AA20 (2 NO + 2 NC)
A
10
• At 250 V AC
A
–
5
Short-circuit protection
-
1 NO + 1 NC
A
10 (slow)
--
-
2 NO + 2 NC
A
6 (slow)
--
-
3SE2924-3AA20 (2 NO + 2 NC)
A
10 (slow)
--
-
1 CO contact
A
--
5 (slow)
Mechanical endurance
> 10
6
operating cycles
Material
• Enclosures
Aluminum
casting
Shock-resistant
thermoplast,
self-extinguishing
according to
UL 94 VO
• Covers
Thermoplast
–
• Guard hoods
Aluminum
casting
Metal
Degree of protection
IP65
IP65
Ambient temperature
°C
-25 ... +80
-10 ... +75
Connection
Cable entry,
metric
Cable AWG20, UL
Style 2464, length
3 m
© Siemens AG 2016