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Pololu RC Switches with Isolated Solid State Relay/Switch
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These modules consist of a solid state, single-pole, single-throw (SPST) relay and a control circuit that measures incoming radio control (RC) signals, enabling control of bidirectional, electrically isolated loads in RC systems. Example applications include using extra channels on an RC receiver or servo controller to turn on lights, motors, or irrigation valves.
The RC switch measures the width of incoming RC pulses and compares it to a user-configurable threshold (with ±64 µs of hysteresis) to decide whether to activate the relay. By default, the threshold is approximately 1700 μs, with switch activation occurring above the threshold (longer pulses), but the switch has a learning mode that allows you to change the threshold and the activation direction. A safe-start feature reduces the likelihood of unexpected activation.
The switch control circuit operates from 2.7 V to 16 V, which is wider than the typical range of an RC receiver and can typically be supplied by the RC receiver or servo controller itself.
The switching is performed by a pair of MOSFETs controlled by an optically isolated driver that galvanically isolates the load from the control inputs. The MOSFETs are arranged back-to-back to make the two outputs symmetric and equivalent, allowing bidirectional current control with the switch in any orientation relative to the load (for example, this board can be used for high-side or low-side switching). Benefits over modules with mechanical relays with comparable current ratings include silent operation, a smaller form factor, and immunity to problems like contact wear and arcing that limit the service life of mechanical relays.
Versions of this switch are available with different voltage and current capabilities, and each of those is available with connectors soldered or without connectors:
| Max load voltage |
Max load current |
Connectors | Item # | Price |
|---|---|---|---|---|
| 60 V | 6 A | soldered | #5422 | $13.49 |
| not included | #5423 | $11.95 | ||
| 30 V | 10 A | soldered | #5424 | $14.49 |
| not included | #5425 | $12.95 |
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Typical wiring diagram for the Pololu RC Switch with Isolated Solid State Relay/Switch, SPST. |
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Products in category “Pololu RC Switches with Isolated Solid State Relay/Switch”
| Pololu item #: 5422 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This module is a solid state relay/switch with a radio control (RC) interface, enabling switching of bidirectional, electrically isolated loads in RC systems operating from 2.7 V to 16 V. The activation threshold and direction are configurable, and a safe-start feature reduces the likelihood of unexpected activation. This version can switch up to 6 A of current at voltages up to 60 V (absolute maximum) and ships with soldered header pins and terminal blocks.
| Pololu item #: 5423 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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This module is a solid state relay/switch with a radio control (RC) interface, enabling switching of bidirectional, electrically isolated loads in RC systems operating from 2.7 V to 16 V. The activation threshold and direction are configurable, and a safe-start feature reduces the likelihood of unexpected activation. This version can switch up to 6 A of current at voltages up to 60 V (absolute maximum) and ships without connectors.
| Pololu item #: 5424 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
|
|
|
This module is a solid state relay/switch with a radio control (RC) interface, enabling switching of bidirectional, electrically isolated loads in RC systems operating from 2.7 V to 16 V. The activation threshold and direction are configurable, and a safe-start feature reduces the likelihood of unexpected activation. This version can switch up to 10 A of current at voltages up to 30 V (absolute maximum) and ships with soldered header pins and terminal blocks.
| Pololu item #: 5425 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
|
|
|
This module is a solid state relay/switch with a radio control (RC) interface, enabling switching of bidirectional, electrically isolated loads in RC systems operating from 2.7 V to 16 V. The activation threshold and direction are configurable, and a safe-start feature reduces the likelihood of unexpected activation. This version can switch up to 10 A of current at voltages up to 30 V (absolute maximum) and ships without connectors.
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