Additional electrostatic shielding between the switch and coil helps minimize noise between the coil drive and high voltage circuits,” according to the company. “This shielding is in addition to an internal mu-metal shield that eliminates problems that otherwise would occur due to magnetic interaction when the devices are close together.” - they will be stacked with a step of 6.35 mm.
Differentiated by product numbers starting with 104ES…' (Table on the left), three types of electrostatically shielded dry (dry = mercury-free) reed relays are available, capable of breaking 1.5, 2 or 3 kV DC (unshielded 4 kV types are also available). "The 3kV and 4kV versions have an increased gap between the breaker and the coil contacts to accommodate the higher voltage," said Pickering.
All electrostatically shielded relays are single-pole and normally open. They have a slightly lower coil resistance and therefore consume more power than equivalents without this shielding.
Source: electronicsweekly.com
