Sequent Microsystems 16-Relays 8-Layer Stackable HAT
Compatible with all Raspberry Pi versions
Operates on a 5V power supply with low power consumption
Allows stacking of up to eight 16-Relays cards
Features a momentary on-push button for easy shutdown
Can be installed parallel or perpendicular on a DIN-Rail
The Sequent Microsystems Sixteen Relays 8-Layer Stackable HAT for Raspberry Pi is a versatile card that is compatible with all Raspberry Pi versions, ranging from Zero to 4. This card shares the I2C bus across all stacked cards, utilizing only two of the Raspberry Pi's GPIO pins to manage all eight cards. This unique feature leaves the remaining 24 GPIOs available for the user's convenience.
The 16-Relay card operates on a 5V power supply, which can be sourced either from the Raspberry Pi or from its own 2-pin pluggable connector. The relay coils are also powered by the 5V. The card has a power consumption of 10 mA with all relays off, and each relay requires approximately 80 mA to turn on. If power is supplied to the board's connector, there is no need for an additional power supply for the Raspberry Pi.
The card allows for up to eight 16-rely cards to be stacked on the Raspberry Pi. Each card is identified by jumpers that the user installs to indicate the level in the stack. These cards can be installed in any order, with a three-position jumper selecting the stack level.
The board is safeguarded against accidental reverse power supply with a 5.8 A, 39 mOhm MOSFET, which interrupts the ground line if reverse power is applied.
The card also features a momentary push button installed at the edge of the board, providing a convenient way to shut down the Raspberry Pi. This button is routed to pin 37 (GPIO 26), and a script needs to be written which monitors this pin. If the button is pressed for more than the desired time, it issues the shut-down command.
The 16-Relays Card can be installed parallel on a DIN-Rail using the DIN-Rail Kit Type 1, or perpendicular using the DIN-Rail Kit Type 2.
Important Note: Shutting down the Raspberry Pi by turning off the power can result in SD Card failure. To prevent this, a shutdown command needs to be used before power cut-off. This requires a monitor, keyboard, and mouse connected to the Pi.
1x 16-Relays Add-on HAT for Raspberry Pi
4x M2.5x18mm male-female brass standoffs
4x M2.5x5mm Brass Screw
4x M2.5 Brass Nut
2x Stack Level Jumper
Mounting Hardware
Connector Plugs
Power Supply: 5V/8A pluggable connector with reverse polarity protection
On-board resettable fuse: 3 A
Relays: Normally Open (NO) contacts, 2.5A / 24 VAC / DC
Electrical endurance: Minimum 105 cycles at 1,800 operations per hour, full load
Mechanical endurance: Minimum 107 cycles at 18,000 operations per hour, no load
Perfect add-on to your project when you need to control a large number of loads
Stackable up to 8 layers, this card can add up to 128 relays to each Raspberry Pi in a compact form factor
Pluggable connectors make the 16-Relays card easy to use when multiple cards are stacked up
Relays have N.O. contacts and can switch 24V / 2A AC / DC
Bicolor LEDs are conveniently grouped on one side of the board to indicate when relays are on or off
A power LED shows when power is applied
A reset switch allows for shutting down the Raspberry Pi without the need for a keyboard and monitor
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
This return policy also applies, as a minimum standard, to products sold and fulfilled by third-party vendors through the Marketplace.
United Kingdom consumers exercising their statutory Right of Cancellation are subject to different conditions. See the Statutory Right of Cancellation.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at the Vendor's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
A valid Return Authorisation (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
The RA number is valid for 30 days. The returned item must be received within that period.
The RA number must be included with the return.
Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RobotShop's troubleshooting process or of a verified shipping error by RobotShop.
Refunds are processed within 7 days after receipt and inspection of the returned item.
A £100 cleaning fee may apply to domestic robots returned in used or unclean condition.
A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RobotShop's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
Consumables * — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tyres, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odour-absorbing products). Not eligible for return once unsealed.
Build-it-yourself products and items requiring customer assembly * — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
Digital Goods, Software, and Apps * — Final sale only, due to licensing restrictions.
Clearance Items * — Products identified as clearance or final sale, including end-of-life or discontinued items.
Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
On-Demand Items * — Standard catalogue products not stocked by RobotShop and ordered specifically to fulfil a customer request.
* United-Kingdom consumers retain their statutory Right of Cancellation on these items. Its exercise is subject to the conditions and exclusions set out in the Statutory Right of Cancellation, and any reimbursement may be reduced to reflect a loss in value resulting from handling beyond inspection.
How to Request a Return Authorisation (RA)
While the same return policy applies, these orders require a separate contact process for returns.
RobotShop Fulfilled Orders → submit a support ticket from your account under My Support Tickets.
Marketplace Vendor Orders → submit a ticket from your account under My Marketplace Tickets to contact the vendor directly.
Note: Marketplace vendor products are normally labelled with SKUs starting with RM, and identified on the product page with the mention "Sold and fulfilled by [Vendor Name]".