Cosmo (冠西) Reed Relays | BeiLuo Distributor

About Reed Relays

High-quality reed relays and reed sensors for switching and sensing applications with hermetically sealed contacts.

As an authorized distributor of Cosmo (冠西), BeiLuo provides a comprehensive range of Reed Relays products. These products are widely used in industrial control, automotive electronics, consumer electronics, and communication equipment. We offer a complete product line with multiple series to meet various application requirements. All products are genuine and original, backed by professional technical support and comprehensive after-sales service.

Selection Guide: How to Choose the Right Reed Relays

Product List

6 products available

Part Number ↕	Contact Form ↕	Coil Voltage ↕	Coil Resistance ↕	Switching Voltage ↕	Switching Current ↕	Package ↕	Stock Status	Action
KRE1A05	SPST-NO	5V DC	500Ω typical	200V DC/AC	0.5A	SIP-4	In Stock	View Details
KRE1A12	SPST-NO	12V DC	1000Ω typical	200V DC/AC	0.5A	SIP-4	In Stock	View Details
KRE1C05	SPST-NO	5V DC	500Ω typical	500V DC/AC	0.3A	SIP-4 HV	In Stock	View Details
KRE2A05	SPDT (1 Form C)	5V DC	500Ω typical	200V DC/AC	0.5A	SIP-6	In Stock	View Details
KRE3A05	DPST (2 Form A)	5V DC	500Ω typical	200V DC/AC per pole	0.5A per pole	SIP-8	In Stock	View Details
KRE5A05	SPST-NO	5V DC	250Ω typical	200V DC/AC	0.5A	SIP-4	In Stock	View Details

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Frequently Asked Questions

What are the advantages of reed relays over EMRs?

Reed relays offer: hermetically sealed contacts for long life (>100M operations), smaller size, lower coil power, faster switching, and no contact contamination. EMRs offer higher current capacity and lower contact resistance for high-current applications.

Reed relays for long life/sealing, EMRs for high current.

What coil voltage should I choose?

Choose coil voltage based on your control system: 5V for logic-level control (MCU, TTL), 12V for industrial controls and PLCs, 24V for industrial systems with long cable runs. Higher voltage coils draw less current for the same power.

5V for logic, 12V/24V for industrial.

Do reed relays need coil suppression?

Yes, always use a flyback diode across the coil to suppress voltage spikes when the relay turns off. Without protection, inductive kickback can damage driving circuits. A standard 1N4148 or 1N4001 diode is sufficient for most applications.

Always use flyback diode for protection.

Can reed relays switch AC and DC?

Yes, reed relays can switch both AC and DC within their ratings. The reed switch is polarity-independent. For AC switching, ensure voltage and current ratings are not exceeded. Contact life is typically longer for DC switching than AC due to arcing differences.

Both AC and DC switching supported.

What is the typical life of reed relays?

Reed relays achieve >100 million operations at rated load and >1 billion operations at low-level loads (dry switching). The hermetically sealed contacts prevent contamination, ensuring consistent contact resistance over the relay's lifetime.

100M+ at rated load, 1B+ dry switching.