The KPB385-20 Series brings essential surge protection to the final stage of electrical distribution. As a Type 3 (Class III) SPD, it is engineered to safeguard sensitive electronic devices from low-energy transients and residual surges that originate from internal switching or external lightning events.
Rated for 20 kA (8/20 μs), this compact surge protector is designed for local installation—directly in equipment cabinets, control boxes, or downstream panels—where fast, localized response is critical. It effectively suppresses high-frequency voltage spikes before they reach vulnerable components like sensors, relays, meters, and communication modules.
Its modular, DIN-rail-mountable design ensures simple integration into existing setups, minimizing installation time and panel space. The built-in thermal disconnect mechanism activates automatically under failure conditions, enhancing fire safety and system reliability.
230/400 V AC
Type 3 / Class III SPD for final-stage surge protection
20 kA (8/20 μs) discharge capacity
Ultra-fast response to eliminate residual transients
Modular design with overcurrent and thermal protection
Visual status indicator for easy maintenance (optional)
35mm DIN rail mounting for quick installation
Prevents equipment failure, fire risks, and service downtime
Space-saving and cost-effective
Telecommunications
Power supply system
Infrastructure
Data centers
- Installation must be carried out under power-off conditions. Secure the surge protector KPB385-20 and circuit breaker to the rail respectively, and connect L, N, PE, etc. as shown in the diagram.
- Regularly check the working status of the surge protector. Replace the product immediately if it fails or is damaged.
| Electrical | ||
Model | KPB385-2020 | KPB385-2011 |
Number of Positions | 2-pos. | 2-pos. |
SPD Type per UL 1449 3rd Edition | Type 3 | Type 3 |
SPD Class per IEC 61643-11 | Class III | Class III |
Nominal Operating AC Voltage[Un] | 100-240 V (50/60 Hz) | 100-240 V (50/60 Hz) |
Max. Continuous Operating AC Voltage[Uc] | 385 V (50/60 Hz) | 385 V (50/60 Hz) |
Response time[tA] | ≤ 25 ns | ≤ 25 ns |
Nominal Discharge Current [In] | 10 kA (8/20 μs) | 10 kA (8/20 μs) |
Maximum Discharge Current [lmax] | 20 kA (8/20 μs) | 20 kA (8/20 μs) |
Protection Mode | L/N-G | L/N, N-G |
Voltage Protection Level [Up] | 1500 V | 1500 V |
Degradation Failure Iindication | Red - failure,Green - Normal | Red - failure,Green - Normal |
Remote Signal Contact | Optional | Optional |
Model | KPB385-2040 | KPB385-2031 |
Number of Positions | 4-pos. | 4-pos. |
SPD Type per UL 1449 3rd Edition | Type 3 | Type 3 |
SPD Class per IEC 61643-11 | Class III | Class III |
Nominal Operating AC Voltage[Un] | 208-415 V (50/60 Hz) | 208-415 V (50/60 Hz) |
Max. Continuous Operating AC Voltage[Uc] | 385 V (50/60 Hz) | 385 V (50/60 Hz) |
Response time[tA] | ≤ 25 ns | ≤ 25 ns |
Nominal Discharge Current [In] | 10 kA (8/20 μs) | 10 kA (8/20 μs) |
Maximum Discharge Current [lmax] | 20 kA (8/20 μs) | 20 kA (8/20 μs) |
Protection Mode | L1/l2/L3/N-G | L1/l2/L3/N-G |
Voltage Protection Level [Up] | 1500 V | 1500 V |
Degradation Failure Iindication | Red - failure,Green - Normal | Red - failure,Green - Normal |
Remote Signal Contact | Optional | Optional |
| Mechanical | ||
Connection Mode | Parallel | |
Wiring diameter | 4-25mm² | |
Mounting Method | 35mm DIN-rail | |
Housing Material | Thermoplastic,Extinguishing Degree UL94 V 0 | |
Environmental Ingress Protection Rating | IP20 | |
Enclosure Color | Black | |
Operating Temperature (℃) | -40 ℃ to +80 ℃ | |
Dimensions (L×W×H) | 1-Phase: 90 × 36 × 65 mm 3-Phase: 90 × 72 × 65 mm | |
Weight | 1-Phase: 175 g 3-Phase: 350 g | |
| Standards Compliance&Certifications | ||
Standards | UL 1449 3rd Edition: 2011, IEC 61643-11: 2011, EN 61643-11:2012, IEEE C62.11: 2005, IEEE C62.41: 2002, IEEE C62.45: 2002, NEMA LS-1 | |
| Certifications | CE | |
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