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The EML from GOODSKY is designed to switch high inrush peaks up to 165A/20ms in a very compact housing as space is a limiting factor in most of the typical applications for this component.

Requirements for this switching capability may be found in lighting controls, movement sensors, home automation and security systems such as bus systems and remote switching, energy management and motor controls to name some of the main applications.

EML Reley

The inrush capability is achieved by using an innovative contact system that incorporates a tungsten premake contact with an AgSnO main contact. From the outside the relay is seen as a 1 form A (NO) contact system. The special inside design ensures that the tungsten contact closes before the main contact and takes the inrush peak. Tungsten has a high melting point of 3422°C and thus contact welding is prevented. Shortly after the AgSnO closes and secures a low contact resistance as Tungsten has the disadvantage of a high resistivity.

With its compact dimensions of 29.0x12.6x 15.7mm the EML offers advantages in compact designs such as actuators built in wall sockets. The EML has been applied for UL for the following loads:

  • Tungsten lamp 3,000W/230VAC at 40°C for 30,000 cycles
  • 16A/277VAC cosphi 1 at 85°C for 60,000 cycles


Additionally the following loads were tested at 45°C ambient temperature and a voltage of 230VAC for a minimum of 25.000 cycles:

  • High voltage halogen lamp 2,500W
  • Fluorescent lamps parallel compensated 1,200VA (140μF)
  • Low voltage halogen lamps with inductive transformer 1,200VA (230VAC to 12VDC)
  • Synthetic load to simulate 400W LED retro-fit-lightbulbs (235A peak & 24,5A²s) in process



  • 165A/20ms inrush peak current
  • 16A/277VAC rated load
  • Typical 5mm footprint
  • 1 form A (NO) contact system (Tungsten pre-make & AgSnO)
  • DC coil from 3 to 60 Volts with low power consumption of 400mW only
  • Compact dimensions of 29.0x12.6x15.7mm (L/W/H)
  • Reinforced insulation: > 8mm creepage and clearance safety distances with 5kV dielectric strength between coil and contacts
  • Ambient temperature -45°C to 85°C
  • Flux proof and wash tight version available
  • UL listing applied



Cited from
Author, Michael Blaha, Product Marketing Relays& Switches, CODICO GmbH