High Energy Impulse Current Generator
Up to 150 kA (8/20 μs)
Advanced Testing
Up to 30 kA (10/350 μs)
Tested to IEC 61643-11
State-of-the-art SPD Testing Lab in Southeast Asia
Precision & Accuracy
Built for Reliable Performance
What is an SPD?
Protecting Low-Voltage Systems from Lightning and Switching Surges
A Surge Protective Device (SPD) is a critical component in any compliant low-voltage electrical installation. Its role is to divert transient overvoltages — caused by direct lightning strikes, induced lightning, or switching operations within the grid — safely to earth before they can damage connected equipment.
In Malaysia’s high-keraunic environment, where lightning density exceeds 180 thunderstorm days per year in many regions, unprotected systems are at serious risk. IEC 62305-4 defines a zone-based protection scheme — LPZ 0A through LPZ 3 — requiring coordinated SPD placement at each zone boundary.
Without a properly designed SPD system, a single lightning event can cause catastrophic equipment failure, data loss, fire risk, and costly downtime. This is particularly critical for data centres, hospitals, telecommunications infrastructure and industrial control systems across Malaysia.
Coordinated Type 1, 2 & 3 SPDs placed at LPZ boundaries — not a one-size-fits-all solution
Five mandatory tests: Operating Duty, Temporary Overvoltage, Short Circuit, Voltage Protection Level, and Thermal Stability
Remote alarm contact (Form C) for real-time monitoring and predictive maintenance
IEC 62305-4 — Zones of Protection
Outside — Direct Strike Zone
Outside — Shielded Zone
Inside the Building
Sub-distribution Level
Type 2 or Type 3 SPD near sensitive equipment
Sensitive Equipment Zone
Type 3 / Signal & Data Line SPD at point of use
Complete Surge Protection — Matched to Every Zone & Application
From direct lightning current at the service entrance to coaxial and signal line protection — Tokai supplies a fully coordinated SPD system across all IEC 62305-4 zones.
From direct lightning current at the service entrance to coaxial and signal line protection — Tokai supplies a fully coordinated SPD system across all IEC 62305-4 zones.
Class I
Lightning Current Arrester
For direct lightning current protection at the main distribution board (LPZ 0B → LPZ 1). Handles the full energy of a partial lightning strike.
- 10/350µs waveform
Class I+II · Recommended
Combined Lightning & Surge Arrester
TMP 100KA series. Combined protection against direct lightning and switching surges in a single unit — ideal for main DB installation.
- Up to 200kA Imax · Full mode
Class II
Surge Arrester
Protection against switching surges and transient overvoltages at sub-distribution boards (LPZ 1 → LPZ 2). Most commonly specified type.
- 8/20µs · Up to 40kA+ Imax
Fine Protection Device
Fine Protection Device
Protection against switching surges and transient overvoltages at sub-distribution boards (LPZ 1 → LPZ 2). Most commonly specified type.
- 8/20µs · Up to 40kA+ Imax
Class II — Pluggable
Pluggable Type 2 SPD
Hot-swappable pluggable module design — allows replacement of the SPD cartridge without disconnecting the base, minimising downtime during maintenance.
- Hot-swap · DIN rail
Instrumentation & Control
Signal & Data Line SPD
Protects communication and control lines — RS485, Ethernet, CCTV, Fire Alarm, BACnet, 4–20mA process signals — from surge damage at the connector level.
- Data, Telecom & Control Lines
Real-time Indication
SPD Monitoring Devices
Standalone monitoring units that provide real-time SPD health status, aging indication and remote fault alerts — including Earthing Grid Monitoring capability for BMS integration.
- BMS / SCADA compatible
RF & Special Applications
Coaxial & Special SPDs
Surge protection for RF, coaxial and special application lines — antennas, broadcast, CCTV coax, and telecom RF feeds requiring in-line surge diversion.
- RF, Coaxial & Special
Featured Products
TMP 100KA Series — High Performance Surge Arresters
Tokai’s flagship Class I+II SPDs, combining lightning current and surge protection in a single modular unit. Designed for data centres, industrial facilities and critical infrastructure in Malaysia.
- Class I+II · Type 1+2 · Full Mode · SIRIM Approved
High Surge Capability SPD — Maximum Protection. Ultimate Reliability.
7P
POLE
Advanced Type 1+2 combined SPD for critical power systems and data centres. 7-pole full mode configuration with the highest surge current capability in the Tokai range — up to 200kA (8/20µs) on the N-E path. High energy MOV + GDT technology with encapsulated, non-exhausting spark gap. Suitable for TN-S, TT & IT systems.
Impulse Current (8/20µs)
L-N · L-E · L-L
N-E
150 kA
200 kA
Impulse Current (10/350µs)
L-N
N-E
50 kA
100 kA
MCOV L-N
275 VAC
MCOV N-E
255 VAC
Protection Level (Up)
≤1.5 kV
ISCCR (Short Circuit)
25 kA
- 7-pole full mode protection: L-N, L-E, L-L, N-E — no surge path unprotected
- High energy MOV + GDT technology with encapsulated non-exhausting spark gap
- Thermal disconnect per module — visual status indication (Green: OK / Red: Fault)
- Plug-in modular design, hot swappable — compact 7 module DIN rail width
- Remote alarm contact (Form C) standard — BMS / SCADA ready
- Suitable for TN-S, TT & IT systems · CE · SIRIM Approved · RoHS
- Fully coordinated with downstream Type 2 SPD per IEC 62305-4
- 100kA Imax · 25kA Iimp
TMP 100KA/4
4P
POLE
Class I+II surge arrester for three-phase main distribution boards. 4-pole (3+1) configuration covers L1, L2, L3 and PE — ideal for commercial buildings and industrial facilities.
Uc (Max. Operating Voltage)
255 VAC
In (8/20µs) per pole
100 kA
Imax (8/20µs) per pole
100 kA
Iimp (10/350µs) per pole
25 kA
Protection Level (Up)
≤1.2 kV
Response Time
≤25 ns
- 4-pole (3+1): L1, L2, L3, PE protection
- Internal thermal disconnector with red flag fault indication
- Remote alarm contact (Form C) for BMS / SCADA
- 35mm DIN-rail, 4 modular units · −40°C to +80°C
- Flame retardant thermoplastic: UL94 V-0
- Class I+II · Type 1+2 (B+C) · Full Mode
TMP 100KA/7
7P
POLE
7-pole full mode variant — comprehensive all-mode protection across L-N, L-E and N-E paths. The (3+1+3) configuration is the recommended choice for data centres requiring maximum zone coverage.
Uc (Max. Operating Voltage)
255 VAC
In (8/20µs) per pole
100 kA
Imax (8/20µs) per pole
100 kA
Iimp (10/350µs) per pole
25 kA
Protection Level (Up)
≤1.2 kV
Response Time
≤25 ns
- 7-pole full mode (3+1+3): L1, L2, L3, PE, L1, L2, L3
- All-mode: L-N, L-E and N-E — no surge path unprotected
- Internal thermal disconnector with visual fault indication
- Remote alarm contact (Form C) for BMS / SCADA
- Recommended for hyperscale data centres
- Class II · Type 2 SPD · SIRIM Approved
TMP 320/4
4P
POLE
Advanced Type 1+2 combined SPD for critical power systems and data centres. 7-pole full mode configuration with the highest surge current capability in the Tokai range — up to 200kA (8/20µs) on the N-E path. High energy MOV + GDT technology with encapsulated, non-exhausting spark gap. Suitable for TN-S, TT & IT systems.
L-N (8/20µs)
40 kA
40 kA
40 kA
N-E (8/20µs)
40 kA
L-N (10/350µs)
20 kA
Uc (MCOV)
320 VAC
In (8/20µs)
Protection Level (Up)
≤1.5 kV
ISCCR (Short Circuit)
ISCCR (Short Circuit)
25 kA
- Full mode protection: L-N, L-E, N-E — 40kA (8/20µs) across all modes
- High energy MOV + GDT with encapsulated non-exhausting spark gap
- Thermal disconnect per module · Visual status (Green: OK / Red: Fault)
- Plug-in modular, hot swappable · DIN rail, compact 4 module width
- Remote alarm contact (Form C) · Suitable for TN-S, TT & IT systems
- Fully coordinated with downstream Type 2 SPD per IEC 62305-4
IEC 62305-4 Principle
SPD Coordination — Why One Device Is Never Enough
Effective surge protection is not a single device — it is a coordinated system. IEC 62305-4 requires SPDs to be placed at every Lightning Protection Zone (LPZ) boundary: Type 1 at the service entrance, Type 2 at sub-distribution boards, and Type 3 at sensitive equipment. Each stage progressively clamps the residual surge voltage to a safe level for the next zone.
Coordinated Protection Cascade
Service Entrance
- TYPE 1 SPD — diverts lightning current · Iimp (10/350µs)
Main Distribution Board
- TYPE 2 SPD — clamps switching surges · Imax (8/20µs)
Sub-Distribution Board
- TYPE 3 SPD — fine protection at point of use
Sensitive Equipment Zone
From Our Resources
Many engineers and consultants mistakenly compare SPDs based solely on Imax (8/20µs) ratings. But for facilities in high-keraunic environments like Malaysia’s growing data centre corridor — understanding the distinction between Imax and Iimp (10/350µs) is critical to selecting a Type 1 SPD that provides genuine lightning current protection.
IEC 61643-11 Compliance
SPD Must Be Fully Tested — Not Just Rated
IEC 61643-11 is the international standard for Low Voltage Surge Protective Devices. It ensures SPDs are safe, reliable and effective under real-world conditions — not just peak-rated on a specification sheet.
Consultants and M&E engineers in Malaysia should specify only fully tested and certified SPD systems. Tokai SPDs undergo all five mandatory tests.
Verifies SPD performance under normal operating conditions over simulated lifecycle
Ensures the SPD can safely withstand temporary system overvoltages without failure
Confirms the SPD can safely handle short circuit conditions without fire or explosion risk
Verifies the residual voltage across the SPD remains within safe limits (≤1.2kV for Tokai TMP series)
Ensures the SPD remains stable and self-extinguishing under repeated surge conditions
- IEC 63461 Certified Testing Lab
First IEC 63461 SPD Testing Lab in Southeast Asia
Our state-of-the-art testing laboratory is the first in Southeast Asia to achieve IEC 63461 compliance with high impulse current testing capability — delivering precise, internationally recognised test results for product validation and compliance.
150kA
High Energy Impulse
(8/20µs)
50kA
Lightning Impulse
(10/350µs)
- IEC 63461 compliant — tested to the latest international standard
- High Energy Impulse Current Generator up to 150kA (8/20µs)
- Lightning Impulse Current Generator up to 50kA (10/350µs)
- Highly skilled engineering team ensuring accuracy and safety
- Accurate and reliable testing for product validation
- First IEC 63461 compliant SPD lab in Southeast Asia
Compliant with International Standards
Low-voltage surge protective devices
Protection against lightning
Low-voltage electrical installations
Protection against lightning
Surge protection guidance and practices
Applicable local authority and project specification requirements
Core Protection Zones
Sectors Served
Typical Applications
Why Choose Tokai Surge Protection System?
Tokai brings more than 30 years of field experience in lightning protection, earthing, surge protection, testing, and engineering consultancy. We understand that an SPD is only as effective as the system it is connected to – including the earthing network, cable routing, bonding, upstream protection and maintenance regime.
From risk review and technical selection to installation, testing and long-term support, Tokai delivers surge protection solutions that are practical, compliant and built around real-world infrastructure conditions.
Coordinated Type 1, Type 2 and Type 3 surge protection architecture
Protection against lightning-induced surges and switching transients
Engineered for power, data, signal, telecom, CCTV, BMS, SCADA, and control circuits
Selection based on exposure level, equipment criticality, earthing condition, and system voltage
Reduced risk of downtime, equipment failure, data loss, and premature component degradation
Integration with lightning protection and earthing systems for complete surge risk control
Suitable for retrofitting, new-build projects, and mission-critical infrastructure
Inspection, testing, replacement planning, and lifecycle support available
FAQ
Common Questions About Surge Protection
Understanding Surge Protection for mission-critical power, data, and control networks.
What is the difference between Type 1 and Type 2 SPD?
Can Tokai SPDs integrate with BMS or SCADA?
Which SPD standard applies in Malaysia?
What is Imax vs Iimp in SPD specifications?
Does surge protection replace lightning protection?
Related Solutions & Resources
Complete Your Protection System
Surge protection is one element of a complete lightning protection strategy. Explore related Tokai solutions and technical resources.
Take appropriate measures to protect your facilities today
The Tokai Surge Protection System protects the invisible nervous system of modern infrastructure – power, data, controls and communications. Designed as a coordinated defence architecture, it safeguards continuity, reduces asset failure, and gives critical facilities the resilience to operate through electrical disturbances with confidence.