Abstract: The invention relates to downhole firing tools. In particular, a firing switch for a perforating gun with an EB switch port. The firing switch comprises a body portion configured to be located within the EB switch port, and an electronic addressable switch mechanically coupled to the body portion. The mechanical coupling of the body portion and electronic addressable switch may provide a substantially rigid firing switch.

Abstract: The present invention concerns a firing switch for a downhole ballistics device. More particularly, but not exclusively, this invention concerns a firing switch for a downhole ballistics device and a method of operating the firing switch. The invention also concerns various safety features relating to the firing switch. A firing switch arrangement for a downhole perforating gun (26, 28, 30, 32, 34) is provided, and comprises a firing switch (26?, 28?, 30?, 32?, 34?), and a detonator (40), the detonator arranged to be activated in response to an electrical signal from the firing switch. A removable safety tab (42) is associated with the detonator, the removable safety tab arranged to provide a short circuit to the detonator, such that the short circuit is removed if the removable safety tab is removed.