Obsolete item

This item is not available any more. Some components might no longer be manufactured or there is an improved successor model.

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

DEV-PMR209-dimension

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)

DEV-PMR209-snubber-circuit


Technical Specifications Manufacturer

Technical Specifications

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Obsolete item

This item is not available any more. Some components might no longer be manufactured or there is an improved successor model.

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About ROBOT ELECTRONICS

ROBOT ELECTRONICS is a brand by English manufacturer Devantech Ltd., based in Norfolk. Product range comprises sensors, in particular ultrasonic or compass, servocontrollers as well as small robot drive systems or relay modules with various interfaces. Sensors are produced in England and are of consistently high quality.

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