PCB relays: Songle/SANYOU SRD, Omron G5V, G2RL, G6K, Finder 40, Schrack RT — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/relays-tht/  (CC BY 4.0)
Basis: KiCad 3D models drawn from manufacturer datasheets (SANYOU SRD = the common Songle SRD-xxVDC blue relay)
Catalog version: 2026-10-20

Sizes: see table below
- SRD-05VDC-SL-C (the Arduino module relay): 19.0 × 15.5 × 15.3 mm, 5 pins, 10 A contacts. Pin pattern: coil pins 6.0 mm apart on one end, contacts spread 12.0 mm.
- Omron G5V-1 (signal, 12.5 × 7.5 × 10 mm) and G5V-2 (DPDT, 20.5 × 10 × 11.5 mm) are the small ones; G2RL (29 × 12.7 × 15.7 mm) and Finder 40.52 (29 × 12.5 × 25 mm) are 8–16 A.
- Leave 2 mm around a relay in a printed enclosure; mains relays need creepage: 4 mm from contact pins to any slot.

part  bbox_l_mm  bbox_w_mm  bbox_h_mm
dpdt-finder-40.52  30.3  29.0  12.4
dpdt-omron-g2rl  28.8  19.2  12.5
dpdt-omron-g5v-2  20.3  14.5  9.9
dpdt-omron-g6k-2p  10.0  8.4  6.5
dpdt-schrack-rt2-formc-rm5mm  29.0  21.0  12.7
spdt-finder-40.31  30.3  29.0  12.4
spdt-hjr-4102  15.7  15.0  10.4
spdt-omron-g5v-1  13.4  12.3  7.3
spdt-omron-g6e  15.9  11.3  9.9
spdt-panasonic-jw1-formc  28.6  23.1  12.8
spdt-sanyou-srd-series-form-c  19.6  19.0  15.4
spdt-schrack-rt1-formc-rm5mm  29.0  21.0  12.7
spst-sanyou-srd-series-form-a  19.6  19.0  15.4
spst-sanyou-srd-series-form-b  19.6  19.0  15.4

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- KiCad: kicad-packages3D library (origin of these files) — STEP, WRL — CC BY-SA 4.0 with KiCad exception — https://gitlab.com/kicad/libraries/kicad-packages3D

Free files (CC BY-SA 4.0 (KiCad library license, with the KiCad exception), KiCad library contributors; STEP + STL, 14 parts): https://xemstudio.com/files/kicad/relays-tht/index.json
API: https://xemstudio.com/api/geometry?object=relays-tht