HYDAC EDS 300 - Manual (Page 12)

11. Model code
Series no.
Determined by manufacturer
Type of connection, mechanical
5 = 7/16 SAE4 female
Type of connection, electrical
EDS 3 5 6 - X -XX 4 XX- 00
4 = 4-pole plug M12X1
Output
1 = 1 switching output
2 = 2 switching outputs
3 = 1 switching output and 1 analogue output
Pressure ranges in psi
0150; 1000; 3000; 6000; 9000
Modification number
400 = standard (determined by manufacturer)
vacuum version = 0089 (range -14..75; see also modification number)
401 = vacuum version -14..75 psi (determined by manufacturer)