Contact poles on the D15 relay are of the fixed design and are not convertible. The basic four-pole relay will accept a front-mounted contact pole deck and/or side-mounted contact blocks (one per side). In addition, a side mounted solid state timer or a front-mounted pneumatic timer can be added to the relay. Only one front mounted attachment can be added to the basic relay.
Additional Info: Dimension: 3.30 in. H X 1.80 in. W X 2.96 in. D