PDF: en-icos-sensors-protection-reed.pdf

Reed Switches Protection

Reeds Switches are hermetically sealed contacts actuated by a magnetic field.

The life expectancy of a reed switch refers to a kind of load to be used. Reed Switches of the highest reliability are applied in our level switches, flow switches and their life expectancy can reach above two million operations. However when they are switching lamps, inductive or capacitive loads, this number may decrease.

Switching Power of Reed Contact

It is important to consider that the power specified by an electrical load is often referred to the permanent working state.

• OPERATING VOLTAGE: 110Vac
  • Max. Switching Power: 20VA
  • Max. Switching Current: 0.2A
• OPERATING VOLTAGE: 220Vac
  • Max. Switching Power: 20VA
  • Max. Switching Current: 0.1A
• OPERATING VOLTAGE: 5Vdc
  • Max. Switching Power: 2.5W
  • Max. Switching Current: 0.5A
• OPERATING VOLTAGE: 12Vdc
  • Max. Switching Power: 5W
  • Max. Switching Current: 0.5A
• OPERATING VOLTAGE: 24Vdc
  • Max. Switching Power: 10W
  • Max. Switching Current: 0.5A

24Vac: Recommended use with Schneider Coupling Relay model RSLZVA1.

Relay coupler (110Vac-220Vac): Use 4K7 10W resistor in series.

For higher power, use an auxiliary relay or contactor as recommended below (power consumption table).

• Siemens 3RT1015 Contactor

  Initial: 31.7VA

  Rated: 5.1VA

• Weg CW07 Mini Contactor

  Initial: 19.3VA

  Rated: 5.5VA

• Schneider CA2KN Contactor

  Initial: 30VA

  Rated: 4.5VA

Note: Reed Switches have reached over one million operations in tests with mini contactor and snubber filter K8.

PROTECTION PROCEDURES BELOW DESCRIBED CAN IMPROVE THE REED SWITCH PERFORMANCE

• Switching inductive loads

Reed Switch Contactor

2K2 - 2W
0.1µF 400V

Filter K8 mounted in parallel with the coil of an AC contactor, increases the contact life.

Reed Switch

BY448
or
1N4007

Filter KD mounted in parallel with the coil of a DC relay, increases the contact life.

• Connecting the sensor to a contactor in long distances, use resistor:

D = 20 ~ 40m 22R 5W

This resistor dampens the peak voltage caused by the capacitance of cables and electronic equipment input.

! Important! For distances greater than 40m, use 24Vdc voltage.

• Connecting the sensor to an electronic equipment:

220R 5W

Example:

• • Timing relay
• • Frequency inverter
• • Etc.

! Important! For installation with relay coupler, use 4K7 10W resistor.