Does this work with a particle photon?

I found that the series 3 denuralizer’s photon emitter is phased incorrectly being effected by the relay fly back current, thus under the wave particle duality presumption the photons are not behaving in a sinusoidal manner. Try using 7v for supply voltage.

what does the jumper do?

You can remove the jumper to provide a different power supply (JD-VCC) to the relay actuation circuit from the one used by the host controller and to the LED side of the optocouplers. According to the relay spec, the nominal current draw is 71mA, and if for a 8 relay board that would be 568mA, and if you turn on all 8 relays simultaneously, you'll need 2-3 time more to achieve the latency.

Just purchased one of these. Can I hook it directly to the Raspberry Pi or do I need to use a Mosfet or Opto Isolator?

Based on the picture, this 2 relay shield already has opto isolators for both relays (that is what the two 4 pin modules are). Raspberry Pi uses 3.3V and this uses 5V, so you may want to use a level shifter (or an NPN transistor with two resistors) to keep from overloading the Pi output.

Is this a mechanical relay or an SSR? I am looking for something that will not make an audible sound when switching, and can provide very fast respons

It's a mechanical relay and makes a click, but it is not very loud. There are ssr "relays" available. Make sure to use a good heat sink if you need to switch any real current.

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SunFounder 5V 8 Channel Relay Shield Module for Arduino R3 2560 1280 ARM PIC AVR STM32 Raspberry Pi 3, 2 Model B & B+

SunFounder 5V 8 Channel Relay Shield Module for Arduino R3 2560 1280 ARM PIC AVR STM32 Raspberry Pi 3, 2 Model B & B+

Product ID: 7893719

Details

Brand
SunFounder
Connector Type
Plug-In
Current Rating
10 A
Mounting Type
PCB Mount
Operation Mode
Automatic

⚡5V coil voltage for low power control

💡LED indicators for real-time relay status

🔌8 high-current relay channels, 10A max each

₨432

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Description

🔗 Empower your smart projects with 8-channel relay control—because your innovations deserve the best!

COMPACT DURABLE - Slim 14cm x 5.7cm design fits perfectly on your PCB, built to meet CE & RoHS standards.
HIGH CURRENT HANDLING - Switch heavy loads up to 10A AC/DC without breaking a sweat.
PLUG PLAY POWERHOUSE - Seamlessly control up to 8 devices with a single 5V relay shield.
INSTANT VISUAL FEEDBACK - Built-in LEDs keep you in the loop with real-time relay status—no guesswork needed.
UNIVERSAL COMPATIBILITY - Works flawlessly with Arduino, Raspberry Pi, ARM, PIC, AVR, and more—future-proof your projects.

The SunFounder 5V 8 Channel Relay Shield Module offers robust, low-power relay control compatible with a wide range of microcontrollers including Arduino and Raspberry Pi. Featuring 8 high-current relays rated for 10A each, LED status indicators, and a compact PCB mount design, it’s engineered for reliable automation and smart device management in professional and hobbyist applications.

Specifications

ASIN	B00DR9SE4A
Best Sellers Rank	#35,403 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #56 in Single Board Computers (Computers & Accessories) #496 in Industrial Electrical Controls & Indicators
Brand Name	SunFounder
Coil Voltage	5 volts
Connector Type	Plug-In
Contact Current Rating	10 A
Current Rating	10 A
Customer Reviews	4.6 4.6 out of 5 stars (1,296)
Item Weight	9.07 g
Manufacturer	SunFounder
Maximum Switching Current	10 A
Minimum Switching Voltage	5 volts
Model	8C-5V
Mounting Type	PCB Mount
Operation Mode	Automatic
Part Number	8C-5V
Specification Met	Ce, Rohs, and Other Relevant Electrical Performance, Safety, and Environmental Standards
UPC	520141420814
Unit Count	1 Count
Warranty Description	1 Month
Wattage	50 watts

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₨432

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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