Industrial motor drives
and soft starters
Variable Frequency Drives (VFD)
Soft Starters
Safety standards for VFDs and Soft Starters
Additional resources
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Variable Frequency Drives (VFD)
Explore key functions and solutions
Typically three-phase VFD topology
Highlighting key protection and control component
AC Input
Rectifier
Inverter
Soft Starters
Explore key functions and solutions
Protection and control components for soft starter topology
AC Input
Phase control
AC Input Connection
AC Fuse
Fuse Holder
TMOV
AC Fuse
For overcurrent or short circuit protection
Features:
For higher interrupt ratings:
General:
Extremely current-limiting
Small footprint
200kA interrupting rating
Extremely current-limiting
Small footprint
200kA interrupting rating
Series
For higher interrupt ratings JLS, JLLS, LDC, L70QS
General 606, 504, 505
Fuse Holder
Application function:
Supports fuse protection
Features:
Series
LFT, LFJ
Benefits:
DIN Rail Mountable
Low resistance connection
TMOV
Application function:
Protects against damage due to lightning-induced surges or harmonic voltage disruptions from the power line
Features:
Series
Benefits:
Integrated thermal disconnect enhances safety by disconnecting during MOV EOL caused by continuous abnormal overvoltage from miss wiring or loss of neutral
UL Recognized Type 4 Surge Protection Devices
Integrated thermal disconnect reduces risk of MOV overheating and catastrophic failures
TMOV
Input Rectifier Circuit
Rectifier Module
Rectifier Module
Application function:
Converts AC line voltage supplied to the drive to DC
Features:
Series
MDD, VUO, VUB
Benefits:
Compact design
Better electrical isolations
Package with DCB ceramic
Very low forward voltage drop
Low leakage current
Inverter
High-speed Fuse
TVS Diode
IGBT Module
High-speed Fuse
Application function:
Overcurrent protection
Features:
Series
PSR
TVS Diode
Application function:
Secondary overvoltage protection -- especially for high power line voltage applications of 600V or higher
Benefits:
Accurate low-voltage clamping capability to provide differential protection to the rectifier diodes, capacitor, and IGBT
Features:
Bi-directional, high power TVS Diode rated for 3kA (8/20µs) with a standoff voltage of 380V Maximum clamping voltage of the two AK3-380C TVS Diodes is only 1040V
Series
AK3-380C
IGBT Module
Application function:
Switching power supplies
Benefits:
Short circuit rated for 10µsec
Low gate charge
Low EMI and competitive low Vce(sat)
Features:
Rugged XPT design with thin wafer technology
Series
MIXA, MIXG
Benefits:
Best-in-Class DC Performance
Buss Bar Mount
AC Input
AC Fuse
TMOV
Input Rectifier Circuit
Rectifier Module
Inverter
High speed fuse
TVS Diode
IGBT Module
NTC
AC Input Connection
AC Fuse
Fuse Holder
TMOV
AC Fuse
Application function:
Designed specifically for supplementary protection of semiconducting devices SCRs, diodes and IGBTs
Features:
Series
L50QS, L70QS, JLS, JLLS
Fuse Holder
Application function:
Supports fuse protection
Benefits:
DIN Rail Mountable
Features:
Low resistance connection
Series
LSCR, LFT, LFJ
TMOV
Application function:
Protects against damage due to lightning-induced surges or harmonic voltage disruptions from the power line
Benefits:
Integrated thermal disconnect enhances safety by disconnecting during MOV EOL caused by continuous abnormal overvoltage from miswiring or loss of neutral
Features:
UL Recognized Type 4 Surge Protection Devices
Integrated thermal disconnect reduces risk of MOV overheating and catastrophic failures
Series
TMOV
Phase Control
Dual SCR Module/ Discrete SCR
NTC
Dual SCR Module/ Discrete SCR
Application function:
To control the application of supply voltage to the motor
Benefits:
Space and weight savings
Simple mounting with two screws
Improved temperature and power cycling
Reduced protection circuits
Features:
International standard package, JEDEC TO-240 AA
Isolation voltage 3600 V
UL registered
Series
MCC (Dual SCR Module)
N Capsule series (Discrete SCR)
NTC
Application function:
Semiconductor Temperature Measurement
Benefits:
Rapid thermal response and long time reliability
Features:
UL Recognized (USUR)
Ring lug mounting (USUR)
Hermetically sealed MELF package suitable for operation up to 220°C (SM)
Series
USUR1000, SM
AC Input
AC Fuse
TMOV
Phase Control
SCR Module
Discrete SCR
NTC
Benefits:
Reliable interruption of all overcurrents
Less heating and power consumption
Helps reduce semiconductor failures from over-voltages.
Extremely Current Limiting
Low Watt Losses
Controlled Transient Over-voltages
UL Recognized
Safety standards for VFDs and Soft Starters
IEC 61800-5-2
IEC 60204-1
IEC 62061
ISO 13849-1
IEC 60947-4-2
UL508/CSA C22.2 No. 14
GB14048.6
IEC 61800-5-2
Adjustable speed electrical power drive systems - Part 5-2: Safety requirements – Functional
General Scope
IEC 61800-5-2 specifies requirements and makes recommendations for the design and development, integration and validation of safety related power drive systems (PDS(SR)) in terms of their functional safety considerations.
Region:
Global
IEC 60204-1
Safety of machinery – Electrical equipment of machines – Part 1: General requirements
General Scope
Covers both electrical safety and functional safety, and in respect of the latter it specifies requirements for electrical control devices, circuits, and functions.
Region:
Global
IEC 62061
Safety of machinery – Functional safety of safety-related electrical, electronic and programmable electronic control systems
General Scope
Specifies requirements and makes recommendations for the design, integration and validation of safety-related electrical, electronic and programmable electronic control systems (SRECS) for machines.
Region:
Global
ISO 13849-1
Safety of machinery – Safety-related parts of control systems – Part 1: General principles for design
General Scope
Provides safety requirements and guidance on the principles for the design and integration of safety-related parts of control systems (SRP/CS), including the design of software.
Region:
Global
IEC 60947-4-2
Low-voltage switchgear and control gear – Part 4-2: Contactors and motor-starters – AC semiconductor motor controllers and starters
General Scope
IEC 60947-4-2:2011 applies to AC semiconductor motor controllers and starters, which may include a series mechanical switching device, intended to be connected to circuits, the rated voltage of which does not exceed 1000VAC.
Region:
Global
UL508/CSA C22.2 No. 14
Standard for Industrial Control Equipment
General Scope
Cover industrial control devices, and devices accessory thereto, for starting, stopping, regulating, controlling, or protecting electric motors. Devices rated 1500 volts or less.
Region:
North America
GB14048.6
Low-voltage switchgear and control gear. Part 4-2: Contactors and motor-starters. AC semiconductor motor controllers and starters (including soft starter)
General Scope
The Chinese GB14048.6-2008 standard is based on the IEC-standard IEC 60947-4-2
Region:
China
Are you ready to power your applications?
Additional resources
Circuit Protection Solutions
Sensor Solutions
Industrial Power Fuses
Power Semiconductor Solutions
Ground-Fault Protection with VFDs
TVS Diode Protection for VFDs/IGBT Inverters
Download the full Application Spotlight presentation
Reduces damage to equipment caused by heating and magnetic effects of short circuit currents
Compact design
Temperature Sensor
Application function:
Semiconductor Temperature Measurement
Benefits:
Rapid thermal response and long time reliability
Features:
UL Recognized NTC sensor with ring lug mounting (USUR1000)
Hermetically sealed in MELF package suitable for operation up to 220°C (SM)
Series
USUR1000, SM
Temperature Sensor
Form embed
SCR Module
Discrete SCR
NTC
TVS Diode
IGBT Module
NTC
High speed fuse
Request the full Application Spotlight presentation
Download the full Application Spotlight presentation
Request the full Application Spotlight presentation
For higher interrupt ratings:
General:
Extremely current-limiting
Small footprint
200kA interrupting rating
Extremely current-limiting
Small footprint
200kA interrupting rating
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