Miniature modellers steamed iron mini dioramas, as noted in the previous chapters, are set up as modular layouts, where entire towns can be replicated through the use of a single indicator light for an entire section. Mini relays are generally no wider than 20 mm. This entails that a bulk of them would offer 4-8 contact poles and less than 0.3 W of power. Power tailored applications would also benefit from the locking mechanisms, as the granularity offered would result in low energy uses for coils. Surface mount relays in particular would aid in the construction of PCBs, while through hole mounts are built for industrial controls. Being capable of intelligent switch over for 10 mA signals allows ease of use in portable devices and smart home equipment with no worries of reliable control.