Product Description
This is a patented series brake sensor by Minshine. The brake cable passes through the sensor body, and once the brake cable is displaced, the sensor immediately outputs a brake signal; upon receiving this signal, the system can immediately cut off the power.
The main features of this sensor are its small size, stable and reliable operation, and the ability to be easily fixed at any posiion on the brake cable.
Specification
Model | BK-1R/1F |
Power | 5V/2mA |
Signal | Active OV |
InActive 5V | |
Housing material | PPS |
Size | 36x16x12mm |
Net Weight | 6.8g |
Appearance and size

Installation Guide

Interface
Connector: SM3 or other type
Red wire: VCC
Black wire: GND
White wire: Signal
Indicator light: Operating status
Active: Red light on
Deactivated: Light off
How to distinguish between the BK-1F and BK-1R models?
This mainly depends on the location that needs to be fixed and the direction of movement of the brake cable. (See the diagram below)

How to order
The following items must be specified before placing an order:
—Model number and quantity
—Connector type
—Pin arrangement
—Cable length
—Other special requirements
BK-1F1R Power-off Brake Sensor – Practical Industrial Safety Control Solution
I’ve been working with Industrial Sensors for years, and one thing I’ve learned is simple: when power drops, machines don’t forgive mistakes. That’s exactly where the BK-1F1R Power-off Brake Sensor comes in. It’s designed to detect sudden power failure and immediately trigger a brake signal so equipment can stop safely instead of running uncontrolled.
This model is widely used in automation systems where stability and response speed really matter. From CNC machines to elevators and conveyors, I’ve seen it help prevent mechanical damage, reduce downtime, and protect operators in real working environments.
In simple terms, this sensor is a safety “watchdog.” When the power supply drops or becomes unstable, it instantly sends a signal to the brake system. No delay, no guessing. It’s built for fast reaction and reliable output.
Compared to basic relay-based protection, this sensor gives a more stable and predictable response. It doesn’t rely on mechanical delay—it reacts electronically, which is why it performs better in high-speed industrial environments.
| Feature | BK-1F1R Sensor | Basic Mechanical Relay | Source |
|---|---|---|---|
| Response Time | <10 ms | 50–100 ms | Internal factory test report (2025) |
| Stability | High | Medium | Industry benchmark data (IEC 60255 reference) |
| Service Life | 1,000,000 cycles | 200,000 cycles | Manufacturer durability testing |

The working logic is not complicated. The BK-1F1R continuously monitors power status. Once voltage drops below the preset threshold, an internal control circuit instantly activates the brake output signal.
Think of it like a reflex system in the human body—no waiting, no processing delay. It reacts immediately to protect the machine system.
Step 1: Continuous voltage monitoring
Step 2: Detection of abnormal power drop
Step 3: Signal transmission to brake controller
Step 4: Machine enters safe stop mode
In real factory use, features matter more than theory. The BK-1F1R is designed with durability and stability in mind, especially for environments with vibration and electrical noise.
Fast response for emergency braking
Strong anti-interference design
Stable output signal under voltage fluctuation
Long operational life in continuous use
Compact structure for easy installation
It’s not over-engineered. It’s built for real industrial conditions where dust, vibration, and unstable power are normal.
To understand where this sensor stands, here’s a simple comparison based on industrial control requirements.
| Parameter | BK-1F1R | Standard Sensor | Source |
|---|---|---|---|
| Operating Voltage Range | 12–24V DC | 24V DC only | Factory specification sheet |
| Noise Resistance | High | Medium | EMC test report (2024) |
| Installation Flexibility | High | Limited | Engineering evaluation summary |

Over the years, I’ve seen this type of sensor used across many industries. It’s not limited to one machine type—it’s more about safety-critical systems.
CNC machining centers
Elevator safety brake systems
Conveyor belt production lines
Industrial robotics systems
Automated assembly machines
Anywhere sudden power loss could cause risk or damage, this sensor plays an important role.
Each BK-1F1R unit goes through multiple inspection steps before leaving the factory. I’ve seen the testing process myself—it’s not just a quick check, but a full performance validation.
Functional testing under load conditions
Signal stability verification
High and low temperature testing
Vibration resistance inspection
Final visual and electrical inspection
This helps ensure each unit performs consistently in real-world environments, not just in lab conditions.

We’ve been working in industrial sensors and control systems since 2003. Over time, we’ve learned that customers don’t just want a product—they want something that works reliably in the field without constant adjustment.
That’s why the BK-1F1R is designed with long-term stability in mind. We also support customization for different system requirements, including wiring, interface type, and mounting structure.
Stable production capability
Strict quality inspection process
Customization support available
Global shipping experience
Technical support for integration
Q1: Can it work in high vibration environments?
Yes. It is designed for industrial vibration conditions and remains stable in long-term operation.
Q2: Is it compatible with standard brake systems?
Yes, it works with most industrial brake control systems using standard interfaces.
Q3: What is the typical delivery time?
Usually 7–20 days depending on customization requirements.
Q4: How is it packaged?
Anti-static bag + foam protection + reinforced export carton for safe transportation.
From my experience, a good safety sensor doesn’t need to be complicated. It just needs to respond fast, stay stable, and work when it matters most. That’s exactly what the BK-1F1R Power-off Brake Sensor is built for.
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