PMR209 Snubber

Devantech

The PMR209 provides arc suppression for switching inductive AC loads on relays. The snubber can be simply wired across the common and switched contact to stop the spark, providing extended relay life and reliability.

Technical data

Hardware
Capacitance	0.1 microFarad
Rated Temperature	85°C
Voltage at rated temperature	630 volts
Voltage AC	230VAC
Tolerance	+/-20%
Body Type	Radial Molded
Dielectric	Metallized Paper
Construction	Wound
Application	Capacitor with integrated resistor (Safety:X2)
Temperature Range	-40/85°C
Electrical Name	Resistor
Electrical Value	100
Electrical Units	Ohms
Insulation Resistance	3GOhm

Overview

Capacitor with a film. Main features are:

• 0.1 microFarad
• +/- 20% Tolerance
• -40/+85°C Temperature
• Capacitor with integrated resistor (Safety:X2)
• 630 volt @ 85°C
• Lead spacing = 20.3mm

Dimensions in mm

Dimensions
Symbol	Dimension	Tolerance
L	24	Max
H	14	Max
T	7.6	Max
S	20.3	+/-0.4
LL	30	+5
F	0.8	+/-0.05

Need for RC snubbers across relay outputs

Inductive loads generate voltage spikes when switched, the collapsing magnetic field creates high energy voltage spikes that can get coupled into the low voltage areas on circuitry causing erratic behavior or even crashing the CPU. Adding an RC snubber absorbs the energy created when switching the device off. The snubber also has a secondary benefit of prolonging relay life for inductive loads as it arrests the arc that is generated when switching off.

Examples of inductive loads that need an RC snubber would be:
Motors
Solenoids
Relays (where the coil is driven as a load from the first relay)

Technical Specifications Manufacturer

Technical Specifications

About snubber