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Beuler BU-SSR20 20 AMP Solid State Relay
$39.99
In stock
SKU
BU-SSR20
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- 20-amp automotive solid-state relay
- Normally open electronic switching configuration
- Contactless design with no mechanical moving parts
- Electrical service life of more than 1,500,000 cycles
- Wide 7-18V DC operating voltage range
The Beuler BU-SSR20 Automotive Solid-State Relay provides fast, reliable electronic switching for demanding 12-volt automotive applications. Rated at 20 amps, this normally open relay uses a contactless design with no moving mechanical parts, delivering quiet operation, an electrical life of more than 1.5 million cycles, and ultra-low standby current. Its compact IP67-rated housing, wide 7-18V DC operating range, PWM compatibility, and integrated electrical protection make it ideal for lighting, accessories, motors, fans, and other vehicle circuits. Beuler currently lists the 20-amp solid-state relay in its automotive relay collection.
Unit includes: Solid-state relay.Beuler BU-SSR20 20-Amp Automotive Solid-State Relay
Features:
- 20-amp automotive solid-state relay
- Normally open electronic switching configuration
- Contactless design with no mechanical moving parts
- Electrical service life of more than 1,500,000 cycles
- Wide 7-18V DC operating voltage range
- Ultra-low standby current of 13µA or less
- PWM signal compatible for electronic control applications
- Fast and quiet solid-state switching operation
- IP67-rated protection against dust and water exposure
- Operating temperature range of -40°C to +125°C
- Standard 6.3mm automotive blade terminals
- Compact housing for installation in limited spaces
- Ideal for automotive lighting, fans, motors, accessories, and control circuits
- Complies with RoHS and ELV requirements
Specifications:
- Product type: Automotive solid-state relay (SSR)
- Model number: BU-SSR20
- Rated current: 20 amps
- Contact configuration: Normally open (NO)
- Contactless electronic switching design
- No mechanical contacts or moving parts to wear out
- Electrical life: 1,500,000 cycles or more
- Operating voltage range: 7 to 18 volts DC
- Operating temperature range: -40°C to +125°C
- Storage temperature range: -40°C to +150°C
- Ultra-low standby current: 13µA or less
- PWM signal compatible
- Protection rating: IP67
- Complies with RoHS and ELV requirements
Input and Switching Specifications:
- Input current: 4.8mA minimum, 8.8mA typical, and 10.8mA maximum
- Turn-on voltage range at terminal 86: 4.6 to 18 volts DC
- Turn-off voltage range at terminal 86: 0 to 2.6 volts DC
- Turn-on time: Less than 1,000µs with a 1-ohm resistive load
- Turn-off time: Less than 3,600µs with a 1-ohm resistive load
- Input resistance at terminal 86: 1,675 to 2,047 ohms
- Typical input resistance: 1,842 ohms
- Output voltage drop: 42mV or less at a 10-amp load and 14-volt input
Current and Endurance Specifications:
- Continuous load current at 25°C: 35 amps
- Continuous load current at 85°C: 26 amps
- Continuous load current at 125°C: 21.5 amps
- Electrical endurance: At least 1.5 million cycles using a one-second ON and one-second OFF test cycle
Mechanical Specifications:
- Terminal size: 6.3mm blade terminals
- Terminal retention force, push or pull: 120N or greater
- Housing retention force: 200N or greater
- Terminal pull-out strength: 10N or greater
- Weight: Approximately 33 grams, with a tolerance of ±3.5%
- Housing height: 37mm
- Housing width: 28mm
- Housing depth: 25mm
- Terminal length: 12mm
Terminal Function Definition:
| Pin | Wire Color | Function | Description |
|---|---|---|---|
| 30 | Black | Power Input (+) | Connect to a constant or accessory power source between 7 and 18V DC. This terminal supplies operating power to the solid-state relay. |
| 85 | Red | Ground (-) | Connect directly to a clean chassis ground or battery negative terminal. |
| 86 | White | Operating Input (+) | Apply 7 to 18V DC to turn the relay ON. Remove the operating voltage to turn the relay OFF. The turn-on voltage range is 4.6 to 18V DC. |
| 87a | Not Used | No Connection | Pin 87a is not used on the Beuler BU-SSR20. Do not connect this terminal. |
| 87 | Green | Normally Open Output (+) | Provides 7 to 18V DC to the positive side of the connected load while the relay is activated. Connect the load’s negative terminal directly to chassis ground. |
Operating Notes:
- The operating-voltage specifications shown are based on testing with a 1-ohm resistive load.
- The required input-voltage range may vary under different load conditions.
- Specifications are based on testing performed under defined laboratory conditions.
- Actual performance may vary due to different test conditions, load types, environmental factors, and application requirements.
- The installer is responsible for confirming that the relay is suitable for the intended application.
- Use the product according to its actual operating conditions and electrical requirements.
| Manufacturer | Beuler |
|---|---|
| Part Number | BU-SSR20 |
| California Proposition 65 | |
| Return period | 30 days |
| Exchange period | 30 days |
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Relay Pinout Diagrams Explained
A relay pinout diagram shows the function of each terminal (pin) on a relay and how the internal connections work. It helps you wire the relay correctly for your project.
1. Basic Relay Anatomy
Most automotive relays have two main parts:
- Coil – An electromagnet that switches the relay on/off (low current side)
- Switch Contacts – The high-current switch that turns your accessory on/off
2. Most Common Automotive Relay: 5-Pin SPDT
This is the standard relay type used with sockets like BRSCN, BRSPC, BRSS, etc.
| Pin | Name | Function |
|---|---|---|
| 30 | Common | Power input (goes to the load) |
| 87 | Normally Open (NO) | Closed when relay is energized (ON) |
| 87a | Normally Closed (NC) | Closed when relay is de-energized (OFF) |
| 85 | Coil Ground | Negative side of coil |
| 86 | Coil Positive | Positive side of coil (+12V trigger) |
Visual Pinout Diagram
87
│
87a ───┼─── 30
│
[Relay]
85 ───────── 86
How It Works:
- No power to 85/86 → Current flows between 30 and 87a
- +12V applied to 85/86 → Coil energizes → Current flows between 30 and 87
4. How to Read a Relay Pinout Diagram
Most relay pinout diagrams include the following elements:
- A box or outline representing the relay body
- Pin numbers clearly labeled next to each terminal
- Internal connections shown with lines or dotted lines
- Coil symbol (usually a rectangle or spring-like coil)
- Switch contacts shown with an arrow indicating movement when the relay is energized
Example Relay Pinout Diagram:
87 30
│ │
└──────┬────┘
│
┌──┐ ← Moving Contact
└──┘
/ \
87a (Switches when coil is energized)
85 ───────────── 86
Coil
Understanding the Symbols:
- 30 — Common terminal (input power)
- 87 — Normally Open (NO) contact
- 87a — Normally Closed (NC) contact
- 85 & 86 — Coil terminals (control side)
When the relay coil is energized (pins 85/86 powered), the internal switch moves from 87a to 87.
Quick Wiring Examples (5-Pin Relay)
1. Basic On/Off Circuit (Most Common)
Used for lights, fans, fuel pumps, horns, etc.
- 86 → Switched +12V (from switch, toggle, or ECU output)
- 85 → Ground (or switched ground)
- 30 → Constant +12V Power (from battery or fuse box)
- 87 → Output to Accessory (lights, fan, etc.)
- 87a → Not used (leave disconnected)
2. Changeover / Dual Circuit Setup
Use both 87 and 87a when you need to switch between two different circuits.
- 30 → Input Power
- 87 → Circuit A (ON when relay is energized)
- 87a → Circuit B (ON when relay is OFF)
- 85 & 86 → Coil control
3. Typical Pin Connections Summary
| Pin | Connection | Typical Wire Color | Purpose |
|---|---|---|---|
| 30 | Constant +12V | Black (BRS14E & BRS12E) | Power Input |
| 87 | To Accessory | Green (BRS14E & BRS12E) | Power Output (ON) |
| 87a | Optional 2nd Circuit | Blue (BRS14E & BRS12E) | Power Output (OFF) |
| 85 | Ground | White (BRS14E & BRS12E) | Coil Negative |
| 86 | Switched +12V | Red (BRS14E & BRS12E) | Coil Positive |
Tip: Always use a fused power source on pin 30 for safety.
Basic 5-Pin Relay Wiring Harness
Battery +12V ──► [Fuse] ──► Pin 30 (Common)
Pin 87 ──► Accessory (Lights / Fan / Pump / Amp etc.)
Pin 86 ──► Switched +12V Trigger
(from switch, headlight wire, remote turn-on, etc.)
Pin 85 ──► Ground
Pin 87a ──► (Optional - Not used in basic setup)
Recommended Wiring (Empty relay socket or spade connectors (Not BRS14E & BRS12E):
- Pin 30 — Red wire with inline fuse (closest to battery)
- Pin 87 — Red or Blue wire to device
- Pin 86 — White or Pink trigger wire
- Pin 85 — Black ground wire
Dual Output (Changeover) Relay Harness
Pin 30 → Constant +12V (Fused)
Pin 87 → Circuit A (ON when relay activated)
Pin 87a → Circuit B (ON when relay is off)
Pin 86 → Trigger +12V
Pin 85 → Ground
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