Control System Surge Protector -BS L CD
A Control System Surge Protector BS L CD protects unbalanced interfaces having two single wires that serve measuring and controlling operations. This protector serves field buses and 0-20mA and 4-20mA control lines through their input/output functions in compliance with IEC 61643-21 and EN61643-21 and GB 18802.21.
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Type
BS L CD
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Features
1. For mounting on the 35mm DIN rail. 2. Composed by two parts: the base and the protection module. 3. The signal will not be disconnected when replacing the module. 4. High discharge capacity, low voltage protection level.
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35mm DIN Rail,EN 60715
0-20mA, 4-20mA
Pluggable Design
For 2 signal lines in measuring and control system
High Daicharge Capacity
The high-performance BS L CD Control System Surge Protector from Protect All functions as a protection device against power surges and transient overvoltages for industrial and commercial control systems. This protection device responds within less than 1 nanosecond and exhibits a powerful construction to safeguard PLCs, SCADA systems, sensors, and other automation equipment.
Control System Surge Protector
The Control System Surge Protector exists to protect industrial and commercial control systems against power surges as well as transient overvoltages. The device stops equipment damage from power variations and failures and lightning strikes through its protective functions which preserve control systems' operational stability and prevent equipment breakdowns.
Key Features:
- High Efficiency: The surge protection system features high efficiency to eliminate electrical impacts from both power surges and transient voltage variations, which protects control system equipment.
- Fast Response Time: Can immediately respond to surges by isolating power impacts, ensuring the safety of equipment.
- Low Voltage Trigger Protection: Enables automatic safety activation by set limits to shield equipment from harm caused by overvoltage.

Applications:
- Industrial Control Systems: Supports industrial control systems and automation equipment as well as machinery control systems to maintain continuous operational stability.
- Energy Sector: Protects power equipment, wind turbines, solar power systems, and other devices from power grid fluctuations.
- Building Control: Surge systems in building control protect fire safety systems, building control systems, elevator control systems, and more components in infrastructure.
- Telecommunications: Protects base stations, network equipment, communication lines, and additional telecommunications devices against electrical damage.
- Transportation: Used for surge protection in traffic signal systems, railway control systems, and similar applications.

Technical Data
Nominal voltage d.c. [UN] | 5V | 12V | 15V | 24V | 48V | 60V | 110V |
Rated voltage(max. continuous d.c. voltage) [Uc] | 6V | 15V | 15V | 33V | 54V | 70V | 180V |
Rated voltage(max. continuous a.c. voltage) [Uc] | 4.2V | 10.5V | 18V | 26V | 38.2V | 49.5V | 130V |
Nominal current [IL] | 1A | 0.75A | 0.75A | 0.75A | 0.75A | 1A | 1A |
Lightning impulse current (10/350μs) (per line)[Iimp] | 2.5kA | 2.5kA | 2.5kA | 2.5kA | 2.5kA | 2.5kA | 2.5kA |
Lightning impulse current (10/350μs) (total) [Iimp] | 5kA | 5kA | 5kA | 5kA | 15kA | 5kA | 5kA |
Nominal discharge current (8/20μs) (per line) [In] | 10kA | 10kA | 10kA | 10kA | 10kA | 10kA | 10kA |
Nominal discharge current (8/20μs) (total) [In] | 20kA | 20kA | 20kA | 20kA | 20kA | 20kA | 20kA |
Voltage protection level at Iimp (line-line) [Up] | ≤ 25V | ≤ 50V | ≤ 90V | ≤102V | ≤ 160V | ≤ 220V | ≤ 520V |
Voltage protection level at Iimp (line-PG) [Up] | ≤ 27V | ≤ 37V | ≤ 70V | ≤ 66V | ≤ 95V | ≤ 125V | ≤ 300V |
Voltage protection level at 1kV/us (line-line)/(line-PG) [Up] | ≤ 18V/ ≤ 90V |
≤ 38V/ ≤ 19V |
≤ 50V/ ≤ 25V |
≤ 90V/ ≤ 45V |
≤ 140V/ ≤ 70V |
≤ 180V/ ≤ 90V |
≤ 500V/ ≤ 250V |
Transmission range [F] | 1.0MHz | 2.7MHz | 3.8MHz | 6.8MHz | 8.7MHz | 9.0MHz | 25.0MHz |
Series impedance (per line) [R] | 1.8Ω | 1.8Ω | 1.8Ω | 1.8Ω | 1.8Ω | 1.8Ω | 1.8Ω |
Open circuit voltage(1.2/50μs) | 10kV | 10kV | 10kV | 10kV | 10kV | 10kV | 10kV |
Capacitance (line-line) / (line-PG) [C] | ≤ 2.71nF/ ≤5.41nF |
≤ 1.0nF/ ≤2.0nF |
≤ 0.9nF/ ≤1.8nF |
≤ 0.5nF/ ≤ 1.0nF |
≤ 0.35nF/ ≤ 0.7nF |
≤ 250nF/ ≤ 500nF |
≤ 120nF/ ≤ 240nF |
Response time [tA](line-line) / (line-PG) | ≤ 1ns/≤ 1ns | ≤ 1ns/≤ 1ns | ≤ 1ns/≤ 1ns | ≤ 1ns/≤ 1ns | ≤ 1ns/≤ 1ns | ≤ 1ns/≤ 1ns | ≤ 1ns/≤ 1ns |
Type | BS L CD | ||||||
Art.-No. | 612001 | ||||||
Operating temperature range [Tu] | -40°C…+80°C | ||||||
Cross-sectional area | 0.08mm2-4mm2 solid / 2.5mm2 flexible | ||||||
Mounting on | 35mm DIN rail, EN 60715 | ||||||
Place of installation | Indoor | ||||||
Enclosure material | Orange thermoplastic, UL94-V0 | ||||||
Test standards | IEC 61643-21; EN 61643.21; GB 18802.21 | ||||||
Certification | CE; RoHS; ISO 9001:2015;REACH |
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