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Description. The A421 Series controls are single stage, electronic temperature controls with a single-pole, double-throw. (SPDT) output relay. A421 Series Standard Electronic Temperature Controls with Power Cords Installation Instructions. 2. Parts Included. Each A421 Control includes a Johnson A421ABC-02C. Line-Voltage Type 1 Electronic Temperature Control: Type 1 (NEMA), IP20 standard enclosure for DIN rail and surface-mount applications. Your company account is blocked and you cannot place orders. If you have questions, please contact your company administrator. A421ABC-02C. Johnson ControlsA421ABC-02C. Johnson Controls. JCI Line-Voltage Type 1 Electronic Temperature Control for DIN rail and surface-mount applications rated for 120/240 VAC Single Stage Digital Temperature Control (120/240VAC SPDT). Brand: Johnson Controls. SKU: A421ABC-02C. We have 1 Penn A421ABC-02C manual available for free PDF download: A421AEC Series A421GBF Series A421GEF Series Standard Electronic Temperature Controls.