Pololu Big Pushbutton Power Switch (HP) — Latching Soft Power + Reverse Voltage Protection (4.5–40V)

Upgrade from bulky mechanical switches to a compact solid-state “soft power” switch. The Pololu Big Pushbutton Power Switch (HP) lets you use a momentary pushbutton to control your main DC power: press once to turn ON, press again to turn OFF. Since the load current flows through MOSFETs (not the button), you can use small, low-power tactile switches while still switching high current. Built-in reverse-voltage protection helps protect your project if the battery is connected backwards.

Push-on / push-off latching control: momentary button toggles the power state.
Reverse-voltage protection: helps prevent damage from reversed battery wiring.
High-current capable (HP version): designed for demanding loads and robot drivetrains.
Multiple control options: use ON, OFF, and CTRL pins for MCU control and auto-shutdown.
Multiple buttons: wire several momentary switches in parallel to control power from multiple locations.

Important safety note:

Not an emergency cutoff: do not use as a safety disconnect where failure to cut power could cause injury or property damage.
DC only: this is a DC power switch and does not provide complete isolation in the OFF state.
One-direction switching: power applied to VOUT cannot be switched to VIN.

Why/Benefits

Cleaner power control for projects

Small pushbuttons can control large current (current doesn’t flow through the button)
Less “switch bounce” issues vs traditional latching switches
Great for battery devices that need a neat pushbutton interface

More than a simple switch

Self-shutoff: device can pull OFF to turn itself off (useful for low-battery protection)
Digital control: MCU can command ON/OFF using ON or CTRL
Convenient redundant pads and big power pads (compatible with 5mm terminal blocks)

Technical specifications

Product	Pololu Big Pushbutton Power Switch with Reverse Voltage Protection, HP
Recommended operating voltage	4.5V to 32V
Absolute maximum voltage	40V
Continuous current (typ.)	Up to ~16A (temperature/conditions dependent)
Max MOSFET on-resistance	13 mΩ @ 4.5V; 8.6 mΩ @ 10V
Control inputs	A/B pushbutton pins + ON, OFF, CTRL control inputs
Off-state current	< 0.2 µA (typ. for HP)
On-state current	~120 µA/V (LED-dominated)
LED color	Green
Size	0.8" × 1.0" × 0.16"
Weight	2.7 g

Pinout & power notes

A & B: connect a momentary switch between A and B for normal toggle behavior (push-on / push-off).
ON: a high pulse (>1V) turns the switch ON.
OFF: a high pulse (>1V) turns the switch OFF (lets your load shut itself down).
CTRL: direct control of state (high = ON, low = OFF). Leave floating if unused.
Tip: For motors/inductive loads, keep power wires short and consider capacitors + TVS/diodes to reduce voltage spikes.

FAQ

Can I use multiple pushbuttons?

Yes. You can wire multiple momentary switches in parallel so any button can toggle the power.
Can my microcontroller turn the power off automatically?

Yes. Use the OFF input to let the device shut off its own power (handy for low-battery cutoffs).
Is this a safety disconnect / emergency stop?

No. It’s not intended as an emergency cutoff or safety disconnect.
What voltage should I use?

Use within the recommended 4.5–32V range. Test carefully near the high end of the range for reliable switching behavior.

Big Pushbutton Power Switch with Reverse Voltage Protection, HP

Name: Big Pushbutton Power Switch with Reverse Voltage Protection, HP
Brand: circuitrocks
SKU: POL2813
Price: 542.0 PHP
Availability: InStock