KRE3A05
5V coil DPST reed relay with dual 200V 0.5A contacts, 1000V isolation, SIP package for dual circuit switching.
Product Overview
Description
The KRE3A05 is a DPST (double pole single throw) reed relay with two independent SPST contacts in one package.
Both contacts switch simultaneously with a single 5V coil, ideal for switching paired signals or dual circuits.
The compact SIP package saves space compared to using two separate relays.
Product Series
KRE
Primary Application
Dual signal switching
Key Features
- Dual SPST contacts
- Simultaneous switching
- 5V coil operation
- Hermetically sealed
- 1000V isolation
- Space-saving package
- RoHS compliant
Specifications
| Contact Form | DPST (2 Form A) |
|---|---|
| Coil Voltage | 5V DC |
| Coil Resistance | 500Ω typical |
| Switching Voltage | 200V DC/AC per pole |
| Switching Current | 0.5A per pole |
| Carry Current | 1.0A per pole |
| Contact Rating | 10W per pole |
| Isolation Voltage | 1000Vrms |
| Operate Time | 1.0ms typical |
| Release Time | 0.5ms typical |
| Package | SIP-8 |
| Operating Temperature | -40°C to +85°C |
Applications
Dual signal switching
Sensor signal conditioning
Differential pair routing
Electronic system design
Power rail switching
Electronic system design
Balanced audio
Electronic system design
Instrumentation
Electronic system design
FAE Expert Insights
"The KRE3A05 triple relay packs impressive functionality into a compact package. With three independent switches controlled by a single coil, it's ideal for multi-channel applications. I specified this in a custom test fixture where three different test points needed to be connected simultaneously. The space savings compared to three individual relays is significant. Performance is identical to other KRE series relays - reliable, fast, and low contact resistance. Consider this when board space is at a premium and you need multiple synchronized switches."
DPST reed relay for synchronized dual-circuit switching
— Senior FAE Team, BeiLuo
Frequently Asked Questions
Are the two poles electrically isolated?
The two poles share a common connection between them but are isolated from the coil. Pole-to-pole isolation is typically 500-1000V. For complete isolation between switched circuits, use two separate single-pole relays. The common connection is useful for switching circuits with shared grounds.
Poles share common - not fully isolated from each other.
Do both contacts switch at exactly the same time?
The contacts switch nearly simultaneously with typical skew of <0.1ms. This is much better than using two separate relays where timing can vary significantly. The synchronized switching is important for differential signals and balanced circuits.
Near-simultaneous switching with <0.1ms skew.
What is the total power dissipation with both contacts carrying 0.5A?
Contact resistance is <100mΩ per pole. At 0.5A, power dissipation per pole is P = I²R = 0.25 × 0.1 = 0.025W. Total for both poles is 0.05W. This minimal dissipation allows reliable operation without excessive heating.
0.05W total - minimal power dissipation.
Can the two poles switch different voltages?
Yes, each pole can switch independent circuits at different voltages, provided both are within the 200V rating. The common connection means both circuits must share a common reference point. For completely independent circuits, use separate relays.
Can switch different voltages with common reference.
What is relates to DPST over two SPST relays?
Advantages include: (1) Guaranteed simultaneous switching; (2) Lower component count; (3) Smaller PCB footprint; (4) Single coil driver needed; (5) Better matching between channels. The trade-off is less isolation between switched circuits.
Simultaneous switching, lower component count.