BIGTREETECH BTT Relay V1.2 Automatic Shutdown Module After Printing 3D Printer Expansion Board SKR V1.3 Delta CR10 Extruder Thunder

The BIGTREETECH BTT Relay V1.2 is a high-performance automatic shutdown module designed for 3D printers, enabling safe power management after print completion without manual intervention. Professional 3D printing operators, makerspaces, and industrial fabrication facilities use this expansion board to automate post-print workflows and reduce energy consumption on long-running print jobs. This module solves the critical problem of unattended printer power management by integrating seamlessly with SKR V1.3 control boards and supporting multiple printer architectures including Delta, CR10, and Extruder Thunder systems.

Product Overview

The BTT Relay V1.2 functions as an intelligent power management interface that communicates directly with your 3D printer's motherboard to trigger automatic shutdown sequences upon print completion. The module utilizes a high-current relay circuit capable of switching AC or DC loads up to 30A, making it suitable for controlling heated beds, power supplies, and auxiliary equipment. The relay operates through G-code commands sent from the printer's firmware, allowing users to program custom shutdown sequences that cool the nozzle, retract filament, and safely power down the system without requiring physical presence at the machine.

This expansion board features galvanic isolation between the control circuit and the switched load, protecting your printer's electronics from voltage spikes and back-EMF transients common in high-power switching applications. The V1.2 revision includes improved thermal management with better PCB layout, enhanced noise filtering on signal lines, and compatibility with mainstream firmware including Marlin, Klipper, and RepRap. The module mounts directly onto SKR V1.3 boards via dedicated headers or operates independently through standard 2.54mm pin connectors, providing flexibility for retrofit installations on existing printer setups.

Key Specifications

Specification	Details
Product Type	Automatic Shutdown Relay Module for 3D Printers
Brand	BIGTREETECH
Model	BTT Relay V1.2
Origin	Original and Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Relay Rated Current	30A AC or DC
Control Voltage	3.3V to 5V logic compatible
Switching Voltage	AC 250V or DC 30V maximum
Control Interface	Standard 2.54mm pin headers with SKR V1.3 compatibility
Isolation	Galvanic isolation between control and load circuits
Response Time	Less than 10ms relay activation

Key Features

• 30A relay capacity enables control of high-power loads including heated beds, power supplies, and auxiliary cooling fans without additional external relays
• Galvanic isolation protects printer motherboards from voltage transients and electromagnetic interference generated by inductive loads during switching
• Direct SKR V1.3 integration through dedicated expansion headers eliminates wiring complexity and reduces installation time for compatible printer configurations
• Firmware-agnostic design supports Marlin, Klipper, RepRap, and custom G-code implementations for maximum compatibility across printer platforms
• Fast relay response time under 10ms ensures precise timing synchronization with firmware shutdown sequences and thermal management routines
• Compact PCB form factor fits within standard printer enclosures without requiring external relay modules or additional control circuitry

Applications and Use Cases

• Unattended overnight printing operations on Prusa i3, Anet A8, and Creality CR10 systems where automatic power-down prevents energy waste and reduces fire risk from prolonged heating element operation
• Multi-material Delta printer workflows requiring sequential extruder shutdown and heated chamber cooling before automatic power termination to prevent material degradation
• Industrial prototyping facilities running continuous print queues where automated shutdown between jobs reduces operator workload and improves facility energy efficiency
• Educational makerspaces managing shared 3D printer resources where automatic shutdown prevents accidental equipment damage from unattended machines and enforces safe operating procedures
• High-temperature printing applications using Extruder Thunder or similar hardened nozzles where controlled cooldown sequences prevent thermal shock and nozzle cracking
• Remote monitoring setups integrated with OctoPrint or Klipper web interfaces enabling cloud-based print completion notifications and automatic power management from mobile devices

How to Use

Installation begins by identifying the relay control pins on your SKR V1.3 motherboard or selecting appropriate GPIO pins if using standalone configuration. The BTT Relay V1.2 connects via 2.54mm pin headers with three essential connections: positive 5V logic supply, ground reference, and the control signal line from a designated motherboard output. Secure the module to your printer frame using M3 standoffs, ensuring the relay contacts remain accessible for load wiring. Connect your high-current load such as the heated bed or power supply to the relay's normally-open contacts, observing proper polarity for DC applications and using appropriate gauge wiring for the current rating.

Configure your printer firmware by assigning the relay control pin to a GPIO output in your Marlin configuration or Klipper configuration file. Add a custom G-code macro that triggers the relay shutdown sequence at the end of your print, typically using commands like M81 for power-off or custom M-codes depending on your firmware variant. Test the relay operation under no-load conditions first by manually triggering the control signal through your firmware interface, listening for the characteristic clicking sound indicating successful relay activation. Once verified, perform a complete test print with the relay armed to confirm proper shutdown timing and load control before running unattended print sessions.

Frequently Asked Questions

Is the BTT Relay V1.2 compatible with my Creality CR10 or Ender 3 printer?

Yes, the BTT Relay V1.2 works with any 3D printer using a compatible motherboard with GPIO outputs, including stock Creality boards when upgraded with SKR V1.3 replacements. For printers with original Creality boards, you can wire the relay independently using any available 5V output pin. Compatibility depends on firmware support for custom G-code shutdown sequences rather than the printer model itself.

What is the maximum current the relay can safely switch?

The relay is rated for 30A continuous current at either AC 250V or DC 30V maximum. For heated bed applications typically drawing 10-15A, this provides substantial safety margin. Do not exceed the voltage rating as relay contacts can arc and fail catastrophically. For loads exceeding 30A, use the relay output to trigger a contactor or larger industrial relay.

Can I use this module to control both the heated bed and power supply simultaneously?

The BTT Relay V1.2 contains a single relay with one set of normally-open contacts, so it can only control one load directly. To control multiple loads, you can either use multiple relay modules, wire loads in series if voltage permits, or use the relay output to trigger a larger industrial contactor that controls multiple circuits. For complex shutdown sequences, consider using Klipper firmware which supports multiple GPIO outputs for independent load control.

Does the relay module require external power supply or does it draw power from the motherboard?

The control circuitry draws minimal current under 100mA from the 5V motherboard supply, making it suitable for direct motherboard connection. The relay coil is powered from the same 5V supply. The high-current load you are switching is completely isolated and requires no additional power connection to the module itself.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

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• Returns: 7-day return policy on manufacturing defects only

Buy BIGTREETECH BTT Relay V1.2 Automatic Shutdown Module After Printing 3D Printer Expansion Board SKR V1.3 Delta CR10 Extruder Thunder Online in India

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