Surge Protective Devices (SPDs)
EV Charging Stations SPD->Type 2 / Class ll
Uc(V) :
AC385V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Mode of Protection:
LN,N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
AC Power SPD->Type 2 / Class ll
Uc:
AC385V/420V/440V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Mode of Protection:
L/N-PE; L-N, N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
CCTV & Security SPD
Uc(V) :
DC40V/AC320V
Un(V) :
DC24V/AC220V
In (8/20 μs):
10kA
Imax(8/20 μs):
20kA
Reference Standards:
IEC61643OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
Wind Power SPD->Type 2 / Class ll
Uc(V) :
AC760V/1500V
Un(V) :
AC690V/1140V
In (8/20 μs):
60kA
Imax(8/20 μs):
100kA
Mode of Protection:
L/N-PEReference Standards:
IEC 61643-11OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
Specialized SPDs/Accessories
Test Class:
Type 1 / Class I; Type 2 / Class ll
Ue:
AC220V/380V
Ui:
AC400V
limp(10/350us):
25kA/15kA
Imax(8/20 μs):
100kA/80kA/65kA/40kA/20kA
In(8/20 μs):
60kA/40kA/35kA/20kA/10kA
Reference Standards:
NB/T 42150-2021OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote Signaling
PV DC SPD->DC Power SPD
Un(V) :
DC600V/1000V/1200V/1500V
Uc(V) :
DC670V/1200V/1500V/1800V
In (8/20 μs):
20kA
Imax(8/20 μs):
40kA
Reference Standards:
IEC 61643-31OEM/ODM Acceptable
Additional Function:
Thermal Tripping Protection, Status Indicator, and Remote SignalingSOLUTIONS
Why Choose Us?
Crafting an exceptional user experience is our unwavering pursuit; we approach every detail of product design with meticulous rigor.
Professional SPD Manufacturer
We are a dedicated surge protective device factory with integrated R&D and manufacturing capabilities. Equipped with professional electrical R&D engineers, we focus on SPD production for power, PV, telecom and industrial fields. As a real manufacturer rather than a trader, we guarantee competitive factory-direct prices and stable supply capacity for bulk orders.
Strict Quality Control
Rigorous quality management runs through every production link. Raw material inspection, semi-product aging tests and 100% finished product surge impact testing are mandatory. Our in-house lightning test lab follows IEC 61643 standards, our items pass strict performance screening to ensure safe, durable and certified SPDs for global markets.
Customization Support
We offer full OEM & ODM customization solutions. We can adjust SPD specifications, structures, current parameters, logos and packages based on your project requirements. Our technical team develops tailor-made SPDs for special industry scenarios, supporting small trial orders and fast customized sample delivery.
FAQ
Can CRESIN help distributors build a complete SPD product portfolio?
Yes. CRESIN can help distributors select core models for AC power, solar PV, telecom, signal, and industrial applications, making it easier to cover common market demand with a structured product range.
Does CRESIN provide datasheets for each SPD product?
Yes. CRESIN can provide datasheets including product parameters, wiring diagrams, dimensions, discharge current, voltage protection level, response time, standards, and installation information.
What information is needed to recommend the correct SPD?
Normally, the following information is needed: system voltage, AC or DC type, grounding system, installation position, number of poles, discharge current requirement, application scenario, and destination market certification requirements.
Can one SPD be used for all applications?
No. Different applications require different SPD types. AC power systems, solar PV systems, signal lines, telecom lines, and CCTV systems have different voltage levels, current characteristics, wiring structures, and protection requirements.
How should I select SPD voltage?
SPD voltage should match the system operating voltage and grounding system. For AC systems, common Uc options include 385V, 420V, and 440V. For DC systems, especially solar PV systems, common Un options include 600V, 1000V, 1200V, and 1500V DC. The maximum continuous operating voltage Uc of the SPD should be selected based on the rated voltage Un of the power supply system. Uc = 1.1 * Un.
What is the difference between Type 1, Type 2?
Type 1 SPD is usually installed at the main distribution entrance to discharge high-energy lightning currents. Type 2 SPD is installed in sub-distribution boards to limit residual surge voltage.
What is the difference between AC SPD and DC SPD?
AC SPD is used in alternating current power systems such as low-voltage distribution boards, building electrical systems, and industrial panels. DC SPD is used in direct current systems such as solar PV strings, battery systems, and DC control circuits.
What surge protective device products does CRESIN offer?
CRESIN offers AC power SPD, DC power SPD, solar PV SPD, signal SPD, telecom SPD, data line SPD, and surge protection products for electrical distribution, renewable energy, communication, security, and industrial control systems.
INTRODUCTION TO SPD
What is Surge Protective Device?
A surge protective device, also known as a surge protector or SPD, is designed to safeguard electrical components against surges in voltage that might happen in the electrical circuit.
Whenever a sudden increase in current or voltage is produced in the electrical circuit or communication circuit as a consequence of outside interference, the surge protection device may conduct and shunt in a very short period of time, preventing the surge from damaging other devices in the circuit.
Surge protective devices (SPDs) are a cost-effective method for preventing outages and enhancing system reliability.
They are typically installed in the distribution panels and play an important role in ensuring the smooth and uninterrupted operation of electronic devices in a wide range of applications by limiting transient overvoltage.
How Does Surge Protective Device Work?
The basic principle behind SPDs is that they provide a low impedance path to ground for excess voltage. When voltage spikes or surges occur, SPDs work by diverting the excess voltage and current to the ground.
In this way, the magnitude of the incoming voltage is lowered to a safe level that doesn't damage the attached device.
To work, a surge protection device must contain at least one non-linear component (MOV or GDT), which under different conditions transitions between a high and low impedance state.
Their function is to divert the discharge or impulse current and to limit the overvoltage at the downstream equipment.
Surge protection devices function under the three situations listed below.
A. Normal Condition (absence of surge)
In case of no surge conditions, the SPD has no impact on the system and acts as an open circuit, it remains in a high impedance state.
B. During voltage surges
In case of voltage spikes and surges, SPD moves to the conduction state and its impedance decreased. In this way, it will protect the system by diverting the impulse current to the ground.
C.Back to normal operation
After the overvoltage has been discharged, SPD shifted back to its normal high impedance state.
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The product range includes production technologies for smart capacitors, digital display meters, surge protectors, dedicated backup protection devices for surge protectors, self-resetting over/under-voltage protectors, control and protection switches, and automatic transfer switches for dual power supplies.
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