Blue Point
Engineering
Design
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R-C Snubber Noise and Arc Suppressor
The R-C Snubber is in t ended t o suppress t he “ induc t ive kick back ” f rom mo t ors,
solenoids, relay coils, pumps or any device t ha t crea t es an elec t ro-magne t ic
collapsing field. High energy noise spikes are genera t ed whenever curren t is
in t errup t ed t hrough an induc t ive load connec t ed t o a swi t ching circui t . These
elec t ro-magne t ic noise spikes (EMI) may in t er fere wi t h elec t ronics equipmen t
causing erra t ic opera t ion, CPU failure and may also accelera t e relay con t ac t
wear. Applied across an induc t ive load, t he R-C snubber suppresses t he elec t rical
noise spikes t o elec t ronics and ex t ends con t ac t life on mechanical relays.
B A
RC Snubber Network
A B
Red Lion Part No= SNUB0000
RC Snubber Network Part
RC Snubber
Network Part
Resistor Capacitor
Relay Contacts
A/B
EMI - EMF
B/A
(NO)
A/B
B/A
Motor, Pump,
Relay, Solenoid
Supply
Voltage
Switch
RELAY
AC
-orDC
Inductive
Load
R-C snubber applied with the suppressor directly across the inductive load contacts
EMI= Elec t ro-Magne t ic in t er ference
Blue Point Engineering
EMF= Elec t ro-Magne t ic Field
www.BPEsolutions.com
Phone (303) 651-3794
Blue Point
Engineering
Design
D
www.BPEsolutions.com
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R-C Snubber Noise and Arc Suppressor
APPLICATION
The inductive load suppressors are effective in both AC and DC Power circuits
Preferred Application Method
R-C snubber should be applied with the inductive load suppressor directly across
the inductive load contacts for best results if possible.
Relay, Microprocessor, Switch
* Control Contact
Supply Power
AC or DC Voltage
(250V MAX)
AC
VDC + -
EMI - EMF
INDUCTIVE
Load
Motor, Solenoid,
Relay, Pump, Coil
R-C SNUBBER
Component
Alternate Application Method
Placing the R-C snubber with the inductive load suppressor across the control
contacts will also work (* Use a snubber across all contacts in the load circuit)
Relay, Microprocessor, Switch
* Control Contact
EMI - EMF
Supply Power
AC or DC Voltage
(250V MAX)
AC
R-C SNUBBER
Component
INDUCTIVE
Load
Motor, Solenoid,
Relay, Pump, Coil
VDC + EMI= Elec t ro-Magne t ic in t er ference
Blue Point Engineering
EMF= Elec t ro-Magne t ic Field
www.BPEsolutions.com
Phone (303) 651-3794
Blue Point
Engineering
Design
D
www.BPEsolutions.com
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R-C Snubber Noise and Arc Suppressor
APPLICATION
MOTOR
INDUCTIVE
Load
Supply Power
AC or DC Voltage
(250V MAX)
AC
VDC + -
Ro t a t i o n
R-C SNUBBER
Component
As Close to Motor as Possible
(+)
Supply Power
AC or DC Voltage
(250V MAX)
(-)
R-C SNUBBER
Component
(-)
Small
Relay
Relay
Control
Coil Side
VDC + -
AC
R-C SNUBBER
Component
Large
Relay
N.O.
COM
N.C.
Microprocessor
or
Switch
Controller
COM
X
N.C.
N.O.
(+)
R-C SNUBBER
Components
EMI= Elec t ro-Magne t ic in t er ference
Blue Point Engineering
Relay
Coil Side
Relay
Switch Side
INDUCTIVE
Load
EMF= Elec t ro-Magne t ic Field
www.BPEsolutions.com
Phone (303) 651-3794
Blue Point
Engineering
Design
D
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R-C Snubber Noise and Arc Suppressor
APPLICATION
Pneumatic
Valve
Supply Power
AC or DC Voltage
(250V MAX)
AC
+
-
R-C SNUBBER
Component
VDC + -
Air
Supply
5/2 Switching
Solenoid Air Valve
+
INDUCTIVE
Load
Air Hose
Air
Hose
Air
Hose
Pneumatic Cylinder
(Double Acting)
EMI= Elec t ro-Magne t ic in t er ference
Blue Point Engineering
EMF= Elec t ro-Magne t ic Field
www.BPEsolutions.com
Phone (303) 651-3794
Blue Point
Engineering
Design
D
www.BPEsolutions.com
Pointing the Way to Solutions!
R-C Snubber Noise and Arc Suppressor
APPLICATION
R-C SNUBBER
Component
A
INDUCTIVE
Load
Relay
(-)
N.O.
Microprocessor
-
COM
Controller
+
N.C.
B
(+)
Relay
Coil Side
Relay
Switch Side
B A
A B
RC Snubber Network
EMI= Elec t ro-Magne t ic in t er ference
Blue Point Engineering
EMF= Elec t ro-Magne t ic Field
www.BPEsolutions.com
Phone (303) 651-3794