This part is a kind of semiconductor called SMIH-24VDC-S-L-A.

Function of this product has Relay.

Manufacturers : NingBo Songle

Image and pinout :

Some of the text within the PDF file :

SONGLE RELAY NingBo Songle Relay Co.,LTD. TUV File No.R9933789 SMIH 1、SPST through DPDT contact arrangements. 2、5KV dielectric,coil to contact. 3、Standard type and plastic sealed type available. 4、High sensitivity type for low coil consumption is available. 5、For electrical device in control system,e.g heating controllers. servo motors,solenoid valves,lifting magnets etc. !COLL SPECIFICATION [at25degrees ] Coil Sensitivity Nominal Voltage (VDC) 3 5 Nominal Current (mA) 120 71 60 40 30 20 15 150 89 75 50 37.5 25 18.7 Coil Resistance (ohm+10%)  17 47 68 155 270 600 1100 12.5 36 50 115 200 450 820 - Power Consumption (w) Pull-in Voltage (VDC) Drop-out Voltage (VDC) Max-Allow Able Voltage(VDC) High Senstivity 6 9 12 18 24 3 5 abt 0.54w 75%Max 5%MIn 130% Standard [ ... ]

SMIH-24VDC-S-L-A PDF Datasheet Download