Description
Product Overview
The HR127 is a high‑quality DIN rail relay manufactured by Standard Motor Products. Constructed with a machined metal exterior, this relay offers robust durability for automotive and industrial use. It features a screw connector type, normally open contacts, and a three‑terminal configuration, making it suitable for horn replacement and other motor‑controlled applications. Dimensions are compact at 2 x 1.4 x 3.4 inches, and it weighs only 2.4 ounces, facilitating easy installation on standard DIN rails.
Usage
Designed for automotive horn systems, the HR127 can be installed in any vehicle that utilizes a DIN rail mounting scheme. Its screw mounting ensures a secure fit even under vibration, while the normally open contacts provide precise control for horn activation. Ideal for mechanics, automotive technicians, and DIY enthusiasts who need a reliable relay for replacement or upgrade projects.

Why Choose Us
Standard Motor Products is renowned for engineering components that meet rigorous automotive standards. The HR127 undergoes strict quality testing, guaranteeing consistent performance and a 4.6‑star rating from verified customers. Our supply chain ensures genuine parts sourced from China with full compliance to industry specifications, giving you confidence in durability and safety.
Key Features
- Durable machined metal housing for long‑term reliability
- Screw mounting compatible with standard DIN rail systems
- Normally open contacts for precise horn control
- Compact size (2 x 1.4 x 3.4 inches) and lightweight design
- Three terminals simplify wiring and installation
FAQ
What type of mounting does the HR127 use?
The relay uses a screw‑type connector and is designed for DIN rail mounting, providing a secure and vibration‑resistant installation.
Can this relay be used for applications other than horns?
Yes, the HR127’s normally open contacts make it suitable for any motor‑controlled circuit where a reliable switch is required.
Is the HR127 compatible with all vehicle makes?
While it is a standard replacement for many automotive horn systems, always verify the original relay specifications to ensure compatibility.
What is the warranty on this relay?
Standard Motor Products offers a one‑year limited warranty covering manufacturing defects.
How do I identify the correct terminals?
The relay has three terminals: one for the power source, one for the load (horn), and a common ground. Refer to the wiring diagram in the product manual for exact connections.








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