FlexTrip

(1 customer review)

FlexTrip is an adjustable electronic fuse (e-fuse) with integrated ideal diode rated for up to 5 A continuous between 3-22 V DC. It is closely related to the Protect Nano, just that it operates over the maximum possible voltage range.

It is electrically and mechanically resettable and has an open-drain power-good (PG) signal for interfacing with microcontrollers and other devices.

USD $20.99

Only 4 left in stock (can be backordered)

Quantity Unit Price
1 - 4 USD $20.99
5 - 9 USD $19.31
10 - 24 USD $17.84
25 + USD $16.37

Description

  • Solderable jumpers for setting overcurrent levels of 0.5, 1, 2, 3, 5, 5.5 A.
  • Power Switch Capability:
    Toggle loads via pulling the reset (RST) pin high.
  • Power Good (PG) Signal
    Open-drain PG signal is normally pulled high to Vcc and otherwise goes LOW during a fault event—tells your microcontroller that power is safely flowing through the IC.
  • Status LED:  A green SAFE LED visually indicates that power is safely flowing through the IC.
  • Thermal Shutdown feature and on-board SMD fuse: In the event that the steady state current draw is exceeded and the board overheats, the IC has a thermal shutdown feature that will kick in around 140-150 C. There is also an 8 A series fuse on the module as a last resort in case a rapid power surge destroys the IC before the shutdown can respond.
  • Soft-start feature: The output gets ramped at around 1 V/ms into your circuit, which helps reduce inrush current on start up and provides a smooth turn-on.

  • Breadboard and SMT Compatible, with space for terminal blocks (included):
    A small 20×26 mm footprint that fits on a standard breadboard makes this ideal for prototyping circuits. It also can be soldered to a larger PCB via castellated pads (SMT footprint available).

Response to Over-Current

FlexTrip is meant to replace fast blow DC fuses that operate at voltages between 3-22 V.

When the current limit is exceeded, it operates in either fast trip or active current limiting mode.

If the exceeded current is lower than double the set threshold current , the device will act like a linear regulator and drop some of the voltage across itself to maintain the threshold current. If the temperature limit of the device is exceeded in this mode, the unit shuts down and is not enabled unless the reset (RST) button is pressed or a 3-15 V signal is applied to the reset pin.

If the current exceeds more than double the set limit, the device turns off without any active current limiting (fast-trip mode)

Resetting the Module after overcurrent events

When the module experiences an overcurrent event and shuts off, it can be reset by pushing the reset (RST) button or by sending an electrical pulse to the reset pin ranging from 3 to 15 V.

Additional Resources

Learn more information to effectively use the FlexTrip in a variety of applications. All content belongs to the original owners, which we have linked.

[Continuous Over-Voltage Protection Circuits]:

  • Understand the pros/cons of solid-state OVP circuits on our blog post here.

[Power ORing and Multiplexing]:

[Intro to e-Fuses]:

  • GreatScott! Explains how eFuses work and why they are awesome (YouTube)

Compare FlexTrip with the Protect Nano, which has built in over and under voltage cutoffs.

Additional information

Weight 0.012 kg
Operating Voltage

3 – 22 V DC (28 V abs. max blocking voltage for e-fuse)
Maximum Continuous Power

110 W
Maximum Continuous Current

5 A @ 25 °C ambient
⚠️ Thermal Warning

FlexTrip can get hot enough to burn you during normal operation at high currents. Handle with caution and allow time to cool before handling.

Downloads

FlexTrip – 3D STEP

FlexTrip – Datasheet

FlexTrip/ProtectNano – Symbol + Footprint for KiCAD 8.0+

Where to buy

Here. Our official website. (Ships direct from Montreal, Canada)

RobotShop Canada (Mirabel, Canada)

RobotShop US (Moors, NY, USA)

Lectronz (Montreal, Canada, with pre-paid taxes for EU citizens for orders < €150)

Elecrow (Shenzhen, China)

Returns and Warranty

Customer satisfaction is important to us, and we will do our best to ensure you have a positive experience with PN Labs products. Please contact us if you need assistance with any part of your PN Labs order.

We offer a 30-day unopened return policy, in addition to any rights you may have under local consumer protection laws. New, unopened items in their original packaging may be returned within 30 days of delivery. Customers are responsible for return shipping, and returns are subject to a restocking fee of $3 plus 15% of the item price. Original shipping charges are non-refundable.

We do not accept returns of partially or fully assembled kits, unpackaged items, batteries, or AC adapters. All returns require a return merchandise authorization (RMA) prior to shipment.

You may cancel an order free of charge if we receive your cancellation request before the order is processed. If payment has already been captured but the order has not yet shipped, cancellations are subject to a 3.5% non-refundable credit card processing fee, which is charged to us by our payment processor. If an order has entered fulfillment or has shipped, a restocking fee of up to 10% may apply to cover handling, inspection, and administrative costs.

Shipping and Delivery

Orders ship within 1–4 business days from Montreal, Canada. We are not responsible for delays due to carriers, customs, weather, or other external factors. Shipping times displayed are estimates and NOT guaranteed delivery times. International shipments are sent DDU (Delivery Duty Unpaid) / DAP (Delivered at Place) unless otherwise stated. The buyer is responsible for all import duties, taxes, tariffs, and fees unless a DDP option is selected at checkout. We reserve the right to cancel any order and to ship using a carrier or service different from the one selected at checkout. Any substituted shipping method will meet the delivery time estimate shown at checkout.

We do not falsify customs forms. Orders are declared with accurate contents and values.

In the event of any discrepancy in the customer’s shipping details, whether intentional or unintentional, we reserve the right to contact the customer via the provided phone number or email. If the order is shipped and returned to us, we will attempt to communicate and allow a response within 2 weeks. After this period, the order will be marked as abandoned, and no refund shall be issued.

Please review Terms of Service page before purchasing. Contact Us if you have any questions.

1 review for FlexTrip

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  1. Marco M

    Nice product

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Is this module guaranteed to protect my circuit in all circumstances? Ethan asked on December 10, 2025

Supply faults come in varying degrees of severity, injecting various amounts of unwanted voltage, current and power. Given this, it is impossible to design a fool-proof circuit protection system that will protect a system in all scenarios. Every circuit protection topology (crowbar, switched-relay, active clamp, switched MOSFET, etc, etc) all have some inherent limitation. We document our products extensively to ensure that customers are informed about what levels of circuit protection our modules offer. If you want more information or something is unclear, contact us!

 Nick answered on December 12, 2025 store manager
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