Overview Product Description Siemens JD63T300 Magnetic Trip Unit 300A 3P Adjustable. Product Videos Custom Field Bin Location AA-1-3-1 Product Reviews Write a Review Write a Review × Siemens Siemens JD63T300 Magnetic Trip Unit 300A 3P Adjustable Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *